t-mag.com usually has excellent written discriptions + pictures. They've covered lots of unusual exercises that other sites don't have. They're not catagorized though, so you have to use the search function.
if you are interested in a forum about traditional weight training, go to groups.yahoo.com and look up Supertraining. Although I do not agree with everything they say on that site, there is some very useful information.
Very sadly though, the site leader, Mel Siff, recently died of a heart attack.