But a couple of good books to get started are:
Teach Your Child to Read in 100 easy Lessons
and the Core Knowledge Series are good, and inexpensive. The Core books are called "Everything Your child should know in Kindergarten" or something like that, and there is one for several years (6th grade maybe?).
The Teach your child to read book is really good. My daughter was reading well before she started Kindergarten the summer she turned 5. Now in 2nd grade, is on a 4th grade level.

And the web has TONS of ideas:
http://www.kinderthemes.com/
http://www.letteroftheweek.com/
http://www.preschoolbystormie.com/
http://www.cstone.net/~bcp/BCPIntro2.htm (this one goes with the Core Knowledge books. Lots of activities and plans!!)