Henderson's chart and www.feathersite.com are two of my favorite sites! Henderson's chart gives you so much detailed breed information in a handy format and I love all the breed pictures on the feathersite.com poultry pages. Feathersite has a lot of great links for other chicken information and businesses, too, but the pictures are real eye candy!
Have you been over to the Mad City Chickens web site or forum? The forum isn't very active, but it's a good place to find someone to split a hatchery order or find some local chickens, when you're ready.
I also like this events calendar for WI. It hasn't been updated for the events in early 2009, yet. It can be a lot of fun to go to shows and look at the different chickens.