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What you mean is a M42x1(42mm dia 1mm pitch Pentax, Practika, "universal" screw mount lens) to a M12x0.5(12mm dia 0.5mm pitch webcam and security cam) adapter.
The trick is to get the adaptor from the astrophotography community which uses telephotolenses for astrophoto purposes. The adapters from Steven Mogg work well and incorporate a 1/4-20 tripod screw for mounting.
http://webcaddy.com.au/astro/adapter.htm
Also note that the FireWire Fire-I has an optional C mount lens adapter:
http://www.unibrain.com/Products/VisionImg/Fire_i_ BC.htm

Check out Spook an open source, highly customizable or embeddible streaming server. It is best paired with a firewire camera, but those can be had easily for $100; I love my UniBrain Fire-i camera. There is also a Freshmeat page on the project.

"In 2055, after the US government falls, and once north america is thrown into anarchy, using late-90's technology, a personal generator or solar cell, I should still be able to record and play an ogg vorbis file, using free software developed running on hardware built in the late-90's."

OK, you got me. Out goes the iPod Nano, I'm gonna get me an iZak

...the RAID isn't going to give you anything. Having a single 500GB drive instead of spreading your data across 2 drives would be more convenient. I do agree with others here that using GbE instead of firewire would be the easier, faster & cheaper option. Unibrain http://www.unibrain.com/1394_products/1394_network ing/firenet_mac.htm has a IP over FW solution for the Mac but it costs just as much as a GbE card.

I'll throw in with the Firewire crowd. IIDC cams are the way to go for compatibility and performance. The IIDC device class is standardized so the same kernel module works with any Fireware cam.

As far as image quality, the best cam I've seen (for a reasonable price) is the Unibrain Fire-i. It works better in low-light situations than any other webcam I've tried.

I've posted a bit of general information on webcam hardware on my webpage, if you want an introduction to the different options you have under Linux. It's a bit dated but mostly still relevant.

Check what these guys do.

Anybody remember if you can run IP over FireWire like you can under FC?

Unibrain offers a product to do just that. IIRC, it encapsulates IP through normal FireWire frames. I don't know if it encapsulates the ethernet layer too, but it may. They offer products for both Windows and Mac platforms.

WinXP has some sort of IEEE 1394 networking built in, but I don't know if it's IP-based.

I wonder if they will ever make the Apple laptops able to share out there HD like the old Duo systems.

You're talking about FireWire Target Mode. Most Apple models with built-in FireWire support it, the only exceptions are a few first-gen units like the Blue-and-White G3s. You hold the 't' key as you start up a computer, and it operates as a FireWire hard disk until you power it off.

Oracle has just released some firewire drivers/patches that they claim can be used to create firewire clusters. We use it at my work for networking on w2k machines using this and it's really fast with lower latency than 100Mbit network.

As to 1394 networking being more bandwidth than 100mbit networking that is incorrect. 1394 does have a 400mbit bus but due to all of the overhead involved it can only pump out about 70mbits of actual data per second.

I think you are incorrect; check out some actual numbers for 1394 networking.

Well for macs or windows, you might want to check this.