Finally the feature we all have been waiting is here. Amarok will now support StatSyncing with Last.FM, the largest music social network in this planet. In short, it now means stuff from Amarok like rating of song, First Played and Last Played timings, tags etc will be available in Last.FM and vice versa.
This feature is schedule to ship with Amarok 2.7 to be released at the end of this year. A nice screenshot below shows what exactly it does:
You can learn about compiling this feature right now from the developer's blog.