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On a Windows system, try the following:

1. Find your iphone data files in the following location on a Windows system: C:\Users\[USERNAME]\AppData\Roaming\Apple Computer\MobileSync\Backup\[FOLDER]. Where [USERNAME] is your windows logon username and [FOLDER] could be any iphone/ipad device you've ever synced with that version of Windows. For example, I have three different folders for three different devices.
2. Locate the file named "4096c9ec676f2847dc283405900e284a7c815836" or at least it should begin with "4096...". It should also be the biggest file in the folder.
3. Download "SQLite Manager" for firefox: https://addons.mozilla.org/en-US/firefox/addon/sqlite-manager/ and open the "4096..." file.
4. In "SQLite Manager", expand "Tables" and click on a table, and on the right side, select the "browse and search" tab to see if you have any data (you should!). For me, the big ones were:
a. "CellLocation"
b. "CellLocationHarvest"
c. "LocationHarvest"
d. "WifiLocation"
e. "WifiLocationHarvest"
5. On the right side of "SQLite Manager", click on the Export Wizard tab.
6. Select the table you want under the "Name of the table" field, select the check box called "First row contains column names", and click OK. At this point, you can now open that .csv file as in Excel or whatever.
7. Go to: http://www.gpsvisualizer.com/
8. Under "Upload a GPS file:", select the .csv file, and click GO. If your file is not too big, it should plot all your locations.
9. If the website complains your file is too big, open the .csv file in excel and delete all the columns except for Latitude and Longitude. Save, and load again with the website.

Great way to pre-ride a mountain bike race course to know where you are high so you can plan your race for better recovery at each climb and an overall faster time. It's hard to teach yourself to slow it down on the descents (it's just so fun!) without the feedback. This is a great service that I use for all of my post-ride analysis:

http://gpsvisualizer.com/

Funny you should mention that, because GPS Visualizer makes pretty heavy use of XML::Simple to read several XML-based GPS data file formats -- GPX, Garmin Forerunner, LOC, etc.).

(Unfortunately, I wasn't able to use it to create GPX files, because apparently the order of the tags is significant, and XML::Simple doesn't let you set the order.)

I used XML::Simple in a script I wrote to grab data from my garmin GPS to use at http://www.gpsvisualizer.com/ Worked great without a lot of extra stuff to learn for a simple task.

http://www.gpsvisualizer.com/

This thing works great for dumping stuff from my garmin etrex. He has options for google and several other mapping services. Way cool. Now if only he'd support kismet files natively for war driving.

This is a new (not even that new) graphics format. How much totally new stuff could you possibly have to learn?

It's a bit more than that. There is support for interactivity. There is support for pulling in content over HTTP. For example, the SVGs generated by GPS Visualizer pull in maps layers from various bitmap sources, allow you to drag labels around and adjust the opacity of layers using a slider.

Also, Javascript can access SVG DOM. Imagine Google Maps implemented on that kind of technology.

You could, in theory, use SVG to display graphs. I actually considered doing this for a project I was working on last week. Check out, for example, GPS Visualizer. Upload a GPS map with waypoints, and it outputs an SVG file of the map with the access points connected to their locations. (Note that the sample map does not include any waypoints.) Its very neat, you can drag the labels around. With some effort, I'm sure SVG could be used to display an interactive graph that could be manipulated easily. Of course you probably wouldn't want to implement the graph algorithms in JavaScript (to interact with SVG) for any serious application, but there's nothing stopping you. At the very least, SVG might be worth looking into for visualizing the graphs generated by your Java program.

I keep wanting to add support for MLS search result pages to GPS Visualizer, but since every regional system probably has its own output format, I would need to collect lots of sample files. The only one I can parse at the moment is RMLS (Portland, OR), since that's where we bought our house...

For now, at least, you can manually compile a list of houses you want to look at (addresses will suffice; GPS Visualizer can try to find the coordinates) and enter them into GPSV's address form.

I keep wanting to add support for MLS search result pages to GPS Visualizer, but since every regional system probably has its own output format, I would need to collect lots of sample files. The only one I can parse at the moment is RMLS (Portland, OR), since that's where we bought our house...

For now, at least, you can manually compile a list of houses you want to look at (addresses will suffice; GPS Visualizer can try to find the coordinates) and enter them into GPSV's address form.

Try this.

What I would like to see them add is something like what GPSVisualizer does. It will allow you to upload a GPX or LOC file of waypoints (from your GPS or various other programs) and plot them on a map. Because GPSVisualizer requires the SVG plugin (or native support) it would be nice to have an advanced application like Google has that doesn't require such support yet is as smooth/speedy as Google Maps is.

It would be awesome if Google could completely take over the commercial mapping software application market (ie Streets and Trips/Mappoint and Street Atlas) by enabling routing/directions between the points on the map. Hell, allow us to then download the planned route back to the GPSs via a GPX and that would really rock. I mean web-based applications such as maps.google.com and maps.yahoo.com have already taken over from older programs like Automap which just gave text directions and simple maps. Why can't they add even more features? I don't know anyone that asks for directions anymore. Everyone just uses the web-based software.

For now I'm just happy being impressed by the pretty scrolling. I'm excited to see what comes of this after the finish up the Beta.

GPS Visualizer. This site is free and uses SVG to display maps. You can overlay GPX/LOC or track data (among others) over top of maps.

Mentioned in the article's footnotes as "SVG web application": GPS Visualizer.

Its free, and platform-independent. (Unfortunately, Adobe's SVG Viewer doesn't get along well with Mozilla for Windows, but it's fine in WinIE or in any browser in OS X.)

GPS Visualizer might do what you want.

Basically on topic in regards to XML files from GPSs.

You can map (easily) your GPS tracks via GPS Visualizer. Just upload the XML from your GPS and set the maps up the way you want. It's pretty good for small areas (and can be for even large ones if you fool w/it correctly.

I routinely use the site for mapping out geocaches that I am planning on doing. It does require SVG so you might want to nab that if your browser doesn't already support it.