There is so much "pro" to Blackberry, I made this chart comparing the Sidekick 3 to Blackberry 8100.
Eventually, by people's request, I expanded the chart to include all the smart phones by T-mobile.
Wait until the Blackberry 8800 comes out and than there's no reason to get a Sidekick 3 anymore.
http://www.geocities.com/sk3vsbb8100/