MWC 2010
We spent a few moments with Dell's flagship Android device, the Dell Mini 5. This device is clearly meant to be used as a mobile Internet device and not a primary phone, but you can make phones calls with it (if you don't mind looking like an idiot).
The Mini 5 has a 5-inch screen that looks great. It may have the same resolution as other, smaller screens (480x800), but the size makes it really pop.
It has three capacitive buttons on the right side (or bottom depending on how you hold it), and they worked well enough to perform searches, get you back to the home screen or open the menus.
Dell has added a lot of its own software and customization to the Android platform, but the basics are still the same. Dell added all the pre-loaded apps to the homescreen, so they are a quick touch away at all times. There's a Facebook widget that works well, there's a really nice video player application, and Dell has done some other nice things with the software that make it perform a bit more like a laptop rather than a smartphone.
Here's a video tour of the Dell Mini 5 in action: