Well I know the android world is going to be a huge one for a longtime so everyone put some input on what device you own what platform you switched from, and why.
Sprint HTC Hero, from Blackberry, got tired of the incremental OS updates and the constant need to reboot the device.
Own the Eris and the Droid thru VZW.
Went from curve 8330m to the droid, never looking back!!!
I'm guessing most of us droid users are from blackberry devices at least that's what it seems like