I recently participated in a bible study through the book of Galatians, via the wonderful ministry IF: Equip. I was encouraged and challenged in my faith, and really liked the simple method they employ to study through each passage.
They have announced their newest study, which kicks off September 16th - Genesis. This should be interesting, since Genesis is the foundation for the rest of the bible, and as such is a key book to study.
If you are interested in joining me in this study, you can find more information here.