Amazon is doing some interesting work to drive an EC2 hosted Android simulator with a Flash front-end, letting to you test drive apps in the browser.

http://gigaom.com/mobile/amazons-testdrive-is-the-real-stren...

That being said, it is ridiculous that there is no built in way to take screens of an app on an Android phone (like the power + home iOS combo). Since Android has the concept of a secure canvas (e.g.sensitive content), this should be stock.

Lack of easy screenshots makes it harder for normal users to blog about and help review and promote an Android app.