Motorola Droid (The first one) -- Had this thing for almost two years now, and I like it but I'm ready to change over to a new phone (see below).
I plan on changing to the iPhone 5 when my contract is up (and it's released of course), never had one (but I've had plenty of iTouch's).
Rating of the Motorola Droid - 8.5/10
It's a great smart phone, but often times I find my droid locking up randomly [getting stuck within web browser, applications, etc.] (but I've heard this was fixed with the newer Droids). I've used plenty of smart phones and I still think personally the iPhone is the best, which is why I'll be switching to the new one when it's released and my contract is up.
Maemo-Linux powered nokia n900
You can install a modified version of android and dual boot it. You can install linux, older versions of mac os x and windows as well It's a very powerful device.
iPhone 4 and a Windows Phone 7 device (samsung focus). I typically use the WP7 device 99% of the time. Cannot wait for Mango. Only time I break out the IP4 is when I'm playing starcraft 2 and wanna pull up my sc2 apps to look at unit stats or something lol. All of my other apps are now available on WP7 now :thumbup1: