I just read Get Ready to Read by Toni S. Gould.  Excellent book!  Borrows many ideas from Maria Montessori.  Great readiness games to play with your three and four year old children. More games for reading, writitng and spelling.  Her opinions on teaching the alphabet sounds before the letter names as well as teaching lower case letters before the upper case letters make so much sense to me.  
http://www.allbookstores.com/search?type=any&q=Toni+S.+Gould&Go.x=0&Go.y=0