I recently had the opportunity to use a
BlackBerry and compare it to the
Nokia E61. I can safely say that even though
RIM pioneered a wonderful concept of mobile email and QWERTY keyboards, it took Nokia to make it into a really usable device.
I have always found the side scrollwheel to be a non-intuitive user interface - it allows movement in only 1 axis (and you can press to select - a second axis). The Nokia joystick allows movement in 2 axis and also acts as a button to select. For example, to move from one icon to another just below it, the Blackberry requires you to scroll through the entire row. In the E61 (and all other Nokia phones having a joystick) I just use the joystick.
There, of course, remain other things that the BlackBerry provides that are missing in the E61. One is a spellcheck/word suggest functionality.From a useability perspective though, the E61 wins hands down. Try one today!