There are over 1000 quilt block patterns with great instructions on this site. This is perfect for those of us who are doing the quilt block swap. You can search for patterns alphabetically or by size, too.
I only discovered the site yesterday, and I was blown away by how much info is there. Apparently a lot of the online quilt block swapping communities use this website to coordinate swaps.
This is a wonderful site with beautiful diagrams. Just one thing to be sensitive to, and that is she has copyrights to her diagrams, and she would like you to ask permission to share/use them. Read the Terms and Conditions on the site. I found free, without strings, quilt patterns at www.freequiltpatterns.com.