Actually the AT&T version has Video Calling as well. It is known as Video Share in the US, and AT&T is the only provider that supports such service.
Canada version has Videocalling and was released months before the USA version.
I like this phone. Sucks because the battery life isn't very long if you talk a lot on it, so you'll have to charge it a lot. I have small fingers so the whole keypad being crowded doesn't bother me. I love the sound on it and the way the looks. True the joystick is difficult to handle, but i think after you use it for a while you'll just more used to it and be able to handle it better. ^^
The U.S. AT&T version (CU720) and the Canada Rogers version (TU720) have replaced the roller navigation with the joystick/scrollwhell due to complaints with the original roller. The newer navigation is a small circle that spins 360 degrees. Also, they made a bit more space for the Call, clear, and end buttom for more space. Both of the North American versions have HSDPA and include microSD card slots, but only the Canada-Rogers version supports Video Calling. Also, they dropped the Schneider-Kreuznach certified lens.