The amateur's mind - Jeremy Silman
Stuck

Post a few games, preferably with annotation and folks are generally good about telling you what to work on. Of course you can never go wrong with studying tactics.

Best to study your own games, fiure out what your weaknesses are. My free video lessons program on YouTube exaplins how to maximize your study time. My video lessons group is now 10th largest on site and growing. Feel free to join us, and learn!
http://www.chess.com/groups/home/nm-aww-rats-free-video-lessons
My USCF rating is stuck around the 1200 mark. I don't know why I'm still there.