Tamara beat me to it, dpreview is great.

And the Canon web site lets you pull up to 3 of their models up side by side fr comparison.

When I bought my new Canon in June, I made a spreadsheet of the features I was interested in. That helped a LOT. I had 2 Canons on the list and filling in the spreadsheet, I discovered one used 2 AA batteries and the other used FOUR! That was a major thing for me. Your spreadsheet should have whatever is important for you.

Happy hunting!