DSLR for beginners

Hi

Photography has fascinated me for a long time and finally I've decided to buy a camera and get started. I've never done any kind of photography before( != I've never used a camera). I'm looking for a entry level or mid-range DSLR. My interests include, but are not limited to, nature, sports and macro.

I don't know a dime about cameras and wouldn't know what's good and what's bad. I'm relying on you experts and Wikipedia.

Any suggestions ?

P.S. Being a student I don't have loads of money so please make sure the camera you're suggesting costs < $600.

Thanks.