I saw the thread title and it reminds me of a similar thread (I thought it was the same one). Was a few months ago though.

I also can't remember the end verdict.

Aha! {old-link-removed}
Talks about DVI cables at least.

Cool. If I have to keep everything separate, at least I know that DVI will work for 25'.

Now that I'm thinking about this more, what I really want is something that will let me extend

2 or more USB ports
2 DVI ports
1 Firewire port

...from my computer to my station(?) where I work from. I know that 30 feet isn't that far but I'd like a clean solution may something that uses Cat5 where I plug everything into a device at one end which is connected to a device at the other end by Cat5/6, fiber, whatever.

I've found a few possible solutions but they would involve using multiple devices, 1 for USB, another for Firewire and I havent found one that does 2 dvi signals yet. If there is one, it'll probably cost more than what I want to pay but it will make me happy just to know one exists.

Also, any ideas about what sort of latency I would/could/should expect?

Well I don't think USB would work past 15 feet.
I haven't looked into it though I recall a few mentionings of it being about that length.

Not sure, don't give up hope.

Your answer is a a pair of baluns. One pair for DVI/VGA and one pair for usb.

(Dead Link Removed)

(Dead Link Removed)

http://www.nti1.ca/pdf/extenders-perspective.pdf

USB works to about 25' with good quality cable.

DVI works to about 25' with good quality triple shielded cable.

VGA works to about 25' with good quality triple shielded cable

PS2 keyboard and mouse to about 15' with good quality cable.

Best of luck!