Userscripts.org

Scrobbles songs from YouTube to Last FM.

Features include:
- Attempt to automatically fill in artist and song title.
- Last.FM authentication without entering your password.
- Both automatic and manual scrobbling.
- Filter words from song titles when automatically filling artist and title information.
- Google Chrome support.

Feedback (suggestions, reviews and bugs) are very welcome!

This script does work in both Firefox (with Greasemonkey installed) and Google Chrome.

Version 1.3.0 and up require Greasmonkey or a HTML5-webbrowser.
Version 1.1.0 and to version 1.3.0 require a HTML5-webbrowser (in other words these versions do not work in old browsers).
Version 1.0.0 and lower only work with Greasemonkey installed.

Last.FM group: http://www.last.fm/group/ScrobbleSmurf

Note for Google Chrome users:
In case you see the Last.FM logo twice in upper-right corner uninstall both versions from the Extensions menu and then reinstall.