I have created several scripts and tools—here is a small excerpt.
Messenger Plus! Scripts
Provides access to bible quotes right in the chat window (supports: ESV, > KJV, NASB, NKJV).
Searches Bing for a term and displays the result directly in the chat window.
Submits your currently playing media to Last.fm.
Play any song instantly. Simply enter /livesong <title or artist> and press Enter.
Notifies you when your currently playing music changes.
Plus! VRT Radiospeler
Listen to all stations of the Belgian VRT, directly in Messenger. Built in cooperation with Bram Lancsweert and VRT.
Adds a contact clock into the chat window notification area. You can set the timezone for each contact individually.
Updates your personal message with your current Twitter Status, with customizable time interval.
Adds other Messenger add-ons with their versions to (!VER).
Easy web display of your Messenger status, with dozens of different styles and automatic status update.
Clubhouse Tags WordPress plugin
Adds Microsoft Clubhouse tags to your blog feed so your posts can propagate on the Clubhouse website and on affiliated websites.
Messenger Aero Switcher
In Windows Live Messenger 2009 on Windows Vista and Windows 7, Aero is used for drawing the window frames of your contact list and conversation (chat) windows.
TxtBear WordPress plugin
Upload documents in PDF, DOC, DOCX, XLS and many other formats to your WordPress site. Then make them super-accessible to your visitors with the embedded Lightbox Viewer.