You'll find plenty of technical reviews on the web regarding features and specs for this camera.
The best thing I think I can provide is my short experience with this camera, so if you used to have a high end P&S camera and is looking to dive into the DSLR world, you are where I was a few weeks ago.
I owned a Sony F717 which I really loved, but honestly, all I did was set it to Auto and take good pictures. The problem was that I had a toddler at home that doesn't really like to wait till the camera took a few secs to focus and take the pic. I was missing those smiles and moments just because the Sony couldn't take pics fast enough.
I decided to look into newer cameras... Initially my budget was around $400 and I was looking to buy the Canon S3. But after spending several weeks online reading reviews (like you probably are right now), I decided that I wanted a DSLR (you'll find plenty of technical reasons in the web and other reviews). I was then ready to buy the Canon Xt (But the Xti was just around the corner, so I decided to wait a couple more weeks and when the Xti was finally released on Sep 1st, I went to Best Buy and got mine)
It's my third week with the camera, and I'm loving it. I can take pictures of my son faster than he can say "bugga bugga bugga". While I'm still learning how to use the camera to its potential (I've been trying to learn how to shoot pictures in manual mode instead of full automatic), I've been fully satisfied with the results so far.
If you're doing what I did last month, you're probably reading tons of reviews of this camera, the Canon Xt, Nikon D50, Nikon D70, Nikon D80, etc. Don't waste your time on the details.. They're all excellent cameras, and if you're coming from P&S, any of these cameras will be an awesome one for you to learn.
I warn you though. The biggest danger of buying this camera is that you'll soon be lusting after lenses... Now I spend hours on the web checking reviews of Canon, Sigma and Tamron lenses, and believe it or not, it's much harder to buy lenses than to buy a camera.
PS: A Great book I I got was "Understanding Exposure" by Bryan Peterson. I actually got the book before the camera, and it was one of the main deciding factors that got me into DSLR instead of a pro P&S. The pictures that Bryan shows in this book are amazing and you need control. Now I'm paranoid with getting the smallest Depth of Field possible in my son's pictures (You'll understand this if you get this book or any other that explains concepts of Exposure)
Update (10/04): After weeks digging forums and reviews, I decided to purchase 2 lenses... The canon 50 f1.8 and the canon 70-300 IS. I'm not going to go over the details for these lenses in this review, but wanted to let you guys know that deciding which camera was the easy part. Deciding the lenses is where all the pain resides.