Earlier quoted context omitted.
Does Last.fm support mean just scrobbling, or are there other features you might like? I'm not a Last.fm user but I'd be willing to take a look into including support down the road!
I just fired this up, it looks and works great! If you did implement last.fm scrobbling (currently I just use a tampermonkey script that works well) I'd start using it primarily.
Hey guys, I implemented a last.fm scrobbling that you can check out here:
http://jamesfator.com/blog/2013/05/17/google-music-app-for-m...
If you're interested, check it out and let me know what you think.