[Mbai2]

If you want a tiny pocketable phone that has PDA and multimedia features along with a non-expandable 4GB internal storage, the Diamond is for you. It lacks a real keyboard, expandable memory, camera flash, and TV-out which the Pro has in addition to everything the Diamond has. These features come at a very small cost on the pro...about .1 inches in thickness.

I originally had the Diamond but the 4GB of memory just wasn't enough so I upped it to the Pro.