BlackBerry Bold 9000, AT&T
I've found that some BB specific shortcuts are hardwired in my brain, for example holding a key in the keyboard for a couple of seconds makes it uppercase (in the BlackBerry). I find myself attempting to do this out of habit all the time in my Droid (I'm sure I'll get used to it, eventually).
I like the bigger screen on this device, I also like the way that web pages can be zoomed in.
I miss how I could use the physical keyboard one handed in the BlackBerry.