I just got my empeg player, and I must say this baby really kicks ass!

I have one simple question:
Can someone recommend some books about C and Linux?

I'm new at Linux and programming. I've been a end-user of Dos and Windows for a couple of years now, and I want to learn more about C programming and Linux. As I can see, some of you guys are really good at this. Where have you learned all this? Any tips?

Thanks
André Johnsen