Most of my birding experience is with Eastern birds, except for when I went to Highlands Biological Station last summer and saw a few Central birds. By Friday I need to learn 134 species of Western birds by visual and vocal observation. Some of these are Eastern species as well, but I think I'm going to have a long couple of days, especially getting used to an old Sibley Western field guide I borrowed. My favorite so far is Steller's Jay. By the way, I recommend the Thayer PC Guide to the Birds of North America to anyone learning birds. It's really wonderful, and has a quiz function.