Comment on GasLight

Works fine here.
Quit iTunes --> move the plugin to ~/library/iTunes/iTunes Plug-ins
Re-start iTunes
Works fine in iTunes 7; here's a snapshot of it working fine on mine (I use AguaT to give a slightly different look to iTunes, but it IS version 7.0):
http://img211.imageshack.us/img211/4452/picture1ll5.png