Here is an unlocked version of the official Last.fm app for Android. This version should let you listen to the radio if you are outside of the US, UK and Germany and are a paid subscriber.
This is only for paid subscribers outside of the US, UK and Germany.
This is not for listening to the radio without paying for a subscription.
If you have the official version of the Last.fm app (from the market) you must uninstall it manually before installing this version!
Usually I post this to the official Last.fm forums but they seem to not like that I'm doing this...