after a month with the motorola droid phone running on android 2.0, the verdict is that it is excellent.
as with every device, there are things that could be improved but overall the best little computer i've ever used.
now if they could only get .net and silverlight running on the thing...
java is ok but i prefer c# hands down.
so far, i've written one simple application called boing, which is a simple todo list. you can add an item with notes and you can delete an item. that's about it but it has replaced the pad of paper that i used to use.
you can get it here by scanning the barcode or view the page on androidlib.com