This extension implements a pane that mimics the behavior of the Facebook “notifications” window. A bubble with the number of new notifications appears on the icon when you have some waiting

Google recently launched Chrome extension to that allows you to receive orkut updates and scrap notifications. The popup menu allows you to quickly jump to a friends’ page, search on orkut, visit your home/scrap/photos pages and share sites on orkut

Loading and starting the Windows Live Messenger Gtalk ,Yahoo mesenger , Rediff messenger or any other messenger when Windows starts slow down the whole system startup process but you can disable this whole process