[countessa]

Learn C - get http://c.learncodethehardway.org and work through it. Seriously, it sounds so simple, but I was in a similar situation to you - learned a bit of this and a bit of that. Nothing boosted my programming knowledge like really working with C. It is the basis of so many modern languages even if just from the syntactical point of view. Plus, learning manual memory management, pointers etc, even if you never have to do it in production, is invaluable in just making a better programmer.