This script adds a button to the toolbar where you can easily enable, disable or cache last.fm submissions if you use the Last.fm Scrobbler Plug-in v1.0.2.5 and above
It looks like this:

Green: Tracks you listen will be submitted immediately.
Yellow: Tracks you listen will be cached untill you enable submissions again (green) - then all listened tracks will be submitted at once.
Red: Tracks will not be submitted.
The cache-feature is very useful if you also submit plays from your ipod. Because if you submit a track on the pc before submitting the (oldeR) ipod plays they will be blocked by last.fm's spamprotection and can't be submitted anymore. With cache enabled it will pause the submissions and submit them later when you want to enable it again after submitting the ipod plays.
Download: Last.fm QuickButton 1.0.1
Changelog 1.0.1:
-Changed: Replaced (ugly) icons with a lot nicer ones. Thanks to nohitter for creating them!

Hope someone likes it!

Big_Berny
PS: I don't have time at the moment to develope it any further because of my exams. So please be patient.