Download MP3Tube:Downloads mp3 from MP3Tube
Folders4Gmail:Organize your Gmail labels in a folder-like hierarchy with the Folders4Gmail userscript.
No Facebook Ads:Frees facebook from ads.Removes Facebook Flyer and Network adverts
Scrap all friends:Sends common scraps to all orkut friends
Enhance GMail:Integration of Google Calendar, and a better Google Chat. Removal of the invites box, Google user id from the top bar, and the footer.
Gmail Beautifier 2.0:Hides/Shows ads in Gmail, widens email body, removes beta from Gmail logo (disabled by default), & gives buttons a better look.