The choice really depends on what you want, what you want to spend, and how comfortable you feel with the UI and button layouts.
I started with a Canon Rebel XSi because a friend of mine had the XS and let me borrow it so I got used to how it worked. The XSi fit my price range and I went from there.
As others have mentioned, glass is important. It will outlast your body by a longshot if you take proper care of it. Nikon and Canon both have excellent quality, although the prices are unfortunately very high. Higher since the tsunami in Japan. I don't know much about Olympus or Sony and their range/quality of glass, but I know Nikon and Canon both have a wide variety.
If you have the time, try taking a visit to The Camera Store and talking to one of their sales reps. They typically have a good understanding and might let you hold a demo body in order for you to get a feel.
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