So I was getting a bit frustrated that all my pictures looked less crisp/clear/focused than my stupid little point and shoot digital. I finally looked it up, because I thought something might be wrong with my camera (I have the Canon Rebel XTi with the EFS 17-55mm lens). SO GLAD I WAS WRONG. Anyway, here's what I found out. This text is quoted from: http://www.cameralabs.com/reviews/Canon400D/
I would recommend leaving your camera at the default settings and try using Photoshop's Unsharp Mask filter. That will give you the best results."