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Any Suggestions on where to go next?
Get a book on C and read it. Now you are going to probably be asking, "What is the BEST book, that covers C." There is no best. Pick one and read it. Don't forget to practice mucho of what you have read. You can start here: http://beej.us/guide/c/src/bgc.html
You should try making a web browser, mp3/multimedia player, IRC client, or general programs for Automating tasks. Well thats what I did when I started learning VB but I believe the learning process is just set a task and learn how to do it. Much easier then reading a bunch of books till your head hurts and you can actually see progress.