Hi,

I'm the author of the very first last.fm player for the android platform (now it has ~20K active installs).

Now the player is available under GPLv3 at http://code.google.com/p/alastfm-player

Yes, nowdays there is an official last.fm client, but if you lack something there you can just grab the my code and do whatever you want with it. I've tried to make my player easily usable on the sunlit street or in the car -- hence the huge control buttons and everything, but there are few nasty bugs which seem to appear sometimes (not for all users) -- so if anyone is interested, feel free to commit patches