Messenger Plus is an add-on for Skype and Windows Messenger which adds lots of these features and extras that make your instant messenger easier, more useful or just tons more entertaining.
Its features include Tabbed Chat Windows, Log Search, Messenger Skinning, Personalized Status, Account Polygamy, Custom Sounds Colors, Formatting and Commands.
This freeware has been updated to support Skype too. Messenger Plus for Skype is a free add-on that enhances the Skype software with cool features and extras. Now you can record your calls in Skype, send winks , flash animations and sounds to your friends, share videos, apply real-time video and voice effects, set a different style and color for your toolbar and much more!
If you are a Skype or a Messenger user, this is one addon you want to check out.
UPDATE: 26 August 2018: The Messenger Plus is no more available.