"A Web widget is a nifty name for a variety of controls that can be used in Web forms, dialogs, and wizards to elicit information from users. "
- J. Bollaert, June 1, 2002
Though the article does not specifically detail the use of widgets in blogs, the web widget definition is one of the best I found. The script is now developed for blog use; create more blog traffic, advertise on a blog, organize topics on a blog, or just for fun. Some of the resources I found for blog or web widgets are:ZoomClouds.
ZoomClouds is a free service utilizing your blog feed, rss or atom, to generate the tag cloud. It is a quick and simple process; create an account with username and email, provide the feed for your blog, and create the cloud to your specifications including color, size of cloud, and font size. The whole process took less than five minutes and I had a tag cloud/zoom cloud to add to my blog this morning.