Listening on Myspace scrobbles live to Last.fm, it doesn't even wait until the song is over to post it like some scripts. Love button works too. Instals and works fine in Google Chrome v17.0.963.79 on Windows 2008 R1, haven't tried in other browsers because Myspace doesn't like the Flash that's installed in Firefox.
Extra points to the developer for matching the new Last.fm buttons to Myspace's UI (at least, the UI as it was at time of writing, 19/3/2012). The buttons aren't spaced well and seem to overlap a few pixels, but that's a petty gripe for an otherwise flawless script.
Nice Scripts, work very good, I really like it.
Nothing to add, just that the script works both in Opera 12 and in FF 16, and that it works well.
I would suggest to author that he adds those URLs to scripts include URLs.