What is Tag Cloud. A tag cloud is a way to display a weighted list such that the weight of each item is reflected by the size of the item's text. Tag clouds provide a quick way for one to eyeball a list and ascertain what items are more prevalent.
Scott Mitchell has just written an article of Creating a Tag Cloud in ASP.NET. That is very cool especially you are dealing with blogging or tagging-related sites. I have tested it, and that's nothing but COOL !