Just to keep answers together, here's my answer from another forum, re-edited:
I don't know of one book that's better than another, but here are two titles I've heard recommended several times:
The New Seed Starters Handbook (by Nancy Bubel)
http://www.amazon.com/s/ref=nb...
This one is more for saving vegetable seeds:
Seed to Seed: Seed Saving and Growing Techniques for Vegetable Gardeners
by Suzanne Ashworth, David Cavagnaro and Kent Whealy
Here's a list of related books that Amazon offers - I can't recommend or criticize any of them :
http://www.amazon.com/s/ref=nb...
