Rainmeter  2.4

Rainmeter displays customizable skins, like memory and battery charge, RSS feeds and weather forecasts, right on your desktop. Many skins are even functional: they can record your notes and to-do lists, launch your favorite applications, and control your media player - all in a clean, unobtrusive interface that you can rearrange and customize to your liking. Rainmeter is at once an application and a toolkit. You are limited only by your imagination and creativity.

Rainmeter can be used as a straightforward skin manager, loading and using skins created by others. However, the real power and fun of Rainmeter can only be unlocked when the transition is made from "user" to "author".