Messenger Plus! Live is an add-on for Windows Live Messenger which adds lots of features and extras that make your instant messenger easier, more useful or just tons more entertaining. The features include: Tabbed Chat, Quick Texts, Custom Sounds, Contacts on Desktop, Messenger Lock, Event viewer and event logging, and many more. Click here to download and try Messenger Plus! Live for Windows Live Messenger. Enjoy!
Source: Messenger Plus! Live