Learning Resources

Hi all,

I recently became interested in modem hacking by watching some defcon videos. My goal is to learn enough to be able to program and possibly contribute to this interesting area.

I mostly program in C, but I recently learned a bunch of MIPS. I'm sure I could pick up another RISC arch fairly easily.

I would appreciate resources to learn the background information. I would also appreciate resources explaining the hardware. I've been looking for a nice project so that I'd have motivation to learn how to interact with hardware, and this looks like a good place to start.

Thanks
zax