Individual bird info?

I have enough books (including Sibley's) to identify most birds I come in contact with but looking for a good book or e-site to find out more about individual species. While ID's are fun, books typically give only a small smattering of info concerning nesting preferences, overall food preferences, mating and so on. Or Is it necessary to just go online and look up each bird individually?
Any information regarding the above would be most appreciated.
Steve

I appreciate your problem. I have been looking for a simple birdhouse plan with dimensions listed as A, B, C, etc - with a chart that lists species down one axis and the A, B, C dimensions across the other. That way I can use one plan to build houses for multiple species - but I may have to research it and do it myself.
And like you, I like watching and IDing birds - but I also like to see them DOING something and know what they are doing and why. In the context of the environment, so to speak.

My favorite guide for IDing birds is Peterson's - I prefer drawings to pictures, & I like the little arrows pointing to field marks I need to watch for. I don't like the range maps that are on an entirely different page. I have an old Audubon guide with photo plates which aren't always clear. But it does have the birds listed by HABITAT instead of family - which is nice. It also gives nesting information, but doesn't list food. Usually if you look at a birds bill, its habitat & whether it is migratory, you can figure out its food (migratory usually equals insects).

Online, I like Cornell. http://www.birds.cornell.edu/Page.aspx?pid=1478
I don't have a "smart phone" - there are more options for you if you do.