About the grip and handling thing, here's a quote from dpreview:
"In the past we've not been big fans of Canon's entry-level models in terms of handling; since the EOS 350D they've been afflicted by a tiny, slim grips that seem to have been designed for the smallest of hands. The 600D finally addresses this with a grip that's slightly deeper, front to back, than its predecessor's, coupled with a sculpted channel on the back that provides a positive anchor point for your thumb.
This makes a big difference to the feel of the camera in your hand, and while users with large mitts may well still find it cramped, it's likely that a lot of users will find the 600D much more comfortable to hold than its predecessors. Personally I found it to be a huge improvement, and the first 'Rebel' class camera that I've been happy to carry around one-handed for an extended session of shooting since the original 300D. "