Our new Indie Games subforum is now open for business in G&T. Go and check it out, you might land a code for a free game. If you're developing an indie game and want to post about it, follow these directions. If you don't, he'll break your legs! Hahaha! Seriously though.
Our rules have been updated and given their own forum. Go and look at them! They are nice, and there may be new ones that you didn't know about! Hooray for rules! Hooray for The System! Hooray for Conforming!
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http://ftp.ipsyn.net/pub/mirrors/cabling/T568B_scheme_opt.jpg
Thats not always a good thing to go by as ethernet patch leads come in pretty much every colour imaginable.
Easiest way is to compare the ends like travathian said.
Straight through cables will have the pins colour-coded the same on both ends, crossover ones will be different on either end.