Be warned though, that jazzing up one's desktop with Yahoo!Widgets will lead to a hit in your overall computing performance because each widget is run like an application. The more widgets you have, the more system resources are used. Best to find the correct balance between the eye-candy and the system resources at your disposal.
I've never really liked the extra junk Yahoo! pushes on me every time I go near their Web site. Yahoo Messenger's the only big exception to things that I'll download because, as you say here, the things are SLOOOOOOOOOOOOW.