The upcoming Google Nexus One phone with Android 2.1 has this built-in feature with which you can set animated wallpaper as your background just like how you can do on HTC HD2 with HTC Sense. Since Android 2.1 has now been ported over to Droid, it is now possible to run animated wallpapers. Thanks to the folks over at DroidForums who have posted a hack to enable this feature on Motorola Droid, running Android 2.1 ROM.
Motorola Droid on Verizon Wireless in US doesn't support multitouch functionality in most apps even though the hardware is fully capable of running it. This is probably due to the US iPhone patents as the upcoming Google Nexus One phone will also have no multitouch functionality in browser and Maps app. The European version of Motorola Droid, called Motorola Milestone is fully capable of pinch to zoom and tap functionality just like the iPhone is.