I'm fairly new to homebrewing and I bought a recipe book for when I'm done with buying kits. I soon realized that they are all for AG. Anyway I found a pretty good document online that talks not only about how to convert recipes form AG to partial mash or exact only. There are also many other pieces of useful information for new brewers. I thought I would share my find with you guys.
http://home.roadrunner.com/~brewbeer/extract/pres.pdf
http://home.roadrunner.com/~brewbeer/extract/pres.pdf