Join Date: Dec 2004
Location: Riverside and San Francisco
Lots of good advice here on the mystery that is photography. I can't speak much on techniques and the science of light, but I will say this from my rookie experience:
Even the barebone entry level that is XSi, it's got enough bells and whistles to mystify a beginner. So, if you're going to make further financial investments on this hobby, invest on lenses instead of a more expensive camera.
Lastly, I encourage you to get a battery grip, the extra weight/bulk actually feels really nice in the hands.