On the plus side:
Warm plastic, comfortable to hold, no sharp edges.
MicroUSB connector. A single cable to share with the Kindle, etc.
Awesome ringtones!
LED and BlackberryBuzz that allows you to configure the LED color and sequence for various app and system events.
Instant true push notification that truly preserves battery life.
Very functional and easy to use clock application.
On the minus side:
Poor camera.
Prediction typing does not correct your word once you advance to the next one, unlike with the iPhone.
Keyboard a bit cramped, I actually type faster on the iPhone, even in portrait mode.
No two-way IMAP synchronization, at least not with Gmail. Email that's read on the Mac is not marked read on the Blackberry, neither it is deleted.
Does not support Google Labs IMAP extensions for Gmail.
Screen too small for apps like Bloomberg or BeReader RSS reader.