Sorry to the regulars for sounding like a broken record, but I'll repeat my usual recommendation. Head to chesscafe.com, click the archives link, and check out Dan Heisman's Novice Nook column. He's a master and professional chess coach who specializes in helping beginner/intermediate level players improve. His monthly column recently passed the 100 article mark, and there's a ton of good advice in there. I'd recommend starting with his early article on a generic study plan and going from there.
--Fromper