Replying to Getting into photography

When I was traveling in USA recently I took a lot of photos and found it really fun. I was just using a cheap point and shoot so the photos were not that great. I am thinking I want to upgrade to something a little better.

From doing some basic research it looks like most people think the Canon Rebel Xsi is a pretty good camera. What other cameras out there are similar which I should check out? Are any of these going to be limiting down the track?

I should note that i know nothing about photography, but I am going to learn.