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Here:

This one has a lot of fancy features for video processing, but no audio switching.

This one switches audio as well but it lacks support for DVI, and it doesn't convert digital analog on the audio. OTH it has 7 inputs...

Like someone said before, there are several SDI-modded DVD transports out there. The idea is, you can then take the SDI and run it into a scaler, either a $4000 stand-alone device or with a PCI-based solution. The last link shows the old Holo3DGraph card that would take video in (SDI, 480i component, S-Video, composite), scale, deinterlace, and process it, then pass it over the PCI bus to your main video card for display. The new H3D-II, which is in beta still (I got one!) can take all that, as well as 1080i/720p inputs over component, RGB, or DVI and scale it to the desired res. Best of all, it has a DVI daughterboard that can output DVI directly, without having to pass video over the bus and incur delay. The DVI DVD player isn't such a big deal. There has been hardware out for more than a year to do that, and more. You just have to know where to look, and be crazy enough to get involved with it.

I forgot to mention that if all you wanted to do was convert HDTV inputs for use with a monitor, another cheaper device called the XBlaster does that (the review mentioned it, I've not used it myself).

Given that you're still downgrading the highest HDTV resolutions, I think an HDTV projector would still be better. Anyone know where you can get a good quality, "cheap" ($2k) HDTV projector that can also accept VGA input?

first off, the nature of most of the replies here seems to indicate that slashdot isn't a great place to ask home theater questions. try the home theater forum on the av science forum. basically, what you are going to want is a vga card with the ability to output arbitrary scan rates and resolutions. try the ATI radeon line using software to adjust your scan rates like powerstrip. finally, as one other poster mentioned, you're going to want a vga to component video transcoder, like this or this. with the appropriate video card and the vga transcoder, you'll be able to run native HDTV resolution into pretty much any consumer grade HDTV set.

the Xbox is capable of 1920x1080 (HDTV), so there would need to be a special output adapter that connects to the back of the console to take full advantage of what your monitor can handle.

Actually this question was just posed on Ask SlashDot about 3 weeks ago here.

The problem you get is that HDTV though it uses a 15-pin mini-D connector, just like VGA, is that HDTV is YPrPb instead of RGB based. So to get the HDTV signal on your monitor, you would first need the XBox HDTV Adaptor, then you would have to convert the HDTV signal to VGA with another adaptor. A response to the previous Ask SlashDot story found this one but that costs $319.

If you go to the official Xbox homepage (as noted in my previous post last month), they'll just tell you flat out that it can't be done.

Here's the product that does what you need.
KD-CTCA2