Here's a nice infographic (click to enlarge).. but it made me chuckle for a reason which I'll explain below.
courtesy of StartApp
What made me chuckle? Well, I recognise that Motorola DROID (it's the GSM version, a Motorola Milestone in fact) because the phone pictured actually belongs to me and the picture has been re-used from Wikipedia (also pictured here). I still use it from time-to-time as a backup phone.. the slide-out keyboard is a bit cramped but is still rather nice to use!