I am looking into purchasing this camera but have a few questions…..first off what kind of memory card does it use and is it worth buying?

The XTi uses Compact Flash (CF) cards. It is a great camera! I'm very happy with mine. Most of the students at the Art Institute use this camera.

If you're willing to learn the manual features, then it's definately worth buying. If you only plan on using it in automatic mode, consider buying a point and shoot instead.