I can't recommend more highly any book written by Judy Martin.( no offense to Nancy)
Judy's books are a bit more on the intermediate side and time intensive. They are worth it!
Here's my favorite:
http://www.amazon.com/Judy-Martins-C...1827998&sr=8-1
By the way, the quilt in my avatar is Judy Martin log cabin.(not from the above book though).