Google Music Frame, an an application that integrates Google Music in the Ubuntu sound menu and adds NotifyOSD notifications got two new very important features in the latest daily PPA builds: multimedia keys support and Last.fm scrobbling (thanks to an user script that you must install manually).
Also, the daily builds PPA now provides packages for Ubuntu 10.10 Maverick Meerkat and 11.10 Oneiric Ocelot too. Soon, it will also support Ubuntu 10.04 Lucid Lynx.
How to enable Last.fm scrobbling in Nuvola Player (For Google Music)
Because setting up Last.fm scrobbling in Google Music Frame / Nuvola Player for Google Music is a bit difficult, I though I'd let you know the exact steps to get it working:
1. Download the user script from here, rename it to "lastfm.js", then open Nuvola Player, go to Options > Preferences > User Scripts and click the "Open user scripts directory" button - copy lastfm.js to the folder that opens in Nautilus.
2. On the same User Scripts tab in Nuvola Player, under "Comma-separated list of user scripts enabled for Google Music", enter: "lastfm", then click Close and restart Nuvola Player.
3. At the top of the Nuvola Player window you should see a new link that says "Last.fm Requires Authentication" - click this link and allow the user script access to your Last.fm account. In my test, an empty popup was displayed after this step - if this occurs, simply close it and you should be redirected back to Google Music.
If everything went fine, you should see a Last.fm link and icon next to your email (upper right corner).