I always go to www.feathersite.com and check out the poultry page! You have to look through all the different breeds (who doesn't love doing that, though?!), which will help with familiarization and breed identification. Good Luck with your chicks!
I also think it's very helpful to have a paper copy of the Cackle Hatchery catalog--it's handy to flip through the pages next to the brooder, and much faster than paging through their webpage to see pictures of the chicks.