I love my XTi. I came from the P&S world and decided to learn about photography and buy a "real" camera about 6 months ago. Since then, it has become almost an obsession. It is unbelievable the pictures you can get from this so-called "entry level" camera once you learn how to use it.
I shoot mainly in Av, and my subject matter is usually my two kids. I just got the Tamron 28-75 f2.8 to replace my kit lens as my main walk-around (although my kit lens is really good), and also have the 50 1.8.
The one thing I will mention, since there are probably quite a few new shooters reading this post, is take the time to load the software that came in the box with your XTi. Digital Photo Professional is really easy to use, and the difference it can make in your final product is amazing. You don't need to shoot RAW if you don't want to. You can go back and fix white balance, and sharpen pics or add/subtract contrast, brightness, etc in less than a minute per shot and make your pics look like the "pro" pics you wanted when you first got a DSLR.
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This one was shot with the kit lens at 55mm wide open (5.6). It is super compressed to fit as an attachment but no other PP done (it looks great in DPP).