Tag Cloud

Tag cloud is a new visual Tool that is starting to spread over website. It's a way of showing importance of items related to a site, usually by displaying it in different font size.
The most popular or important items are bolder and bigger.

Here is the definition from WiKiPedia: http://en.wikipedia.org/wiki/Tag_Cloud

A tag cloud (or weighted list in visual design) can be used as a visual depiction of content tags used on a website. Often, more frequently used tags are depicted in a larger font or otherwise emphasized, while the displayed order is generally alphabetical. Thus both finding a tag by alphabet and by popularity is possible. Selecting a single tag within a tag cloud will generally lead to a collection of items that are associated with that tag.

Four Guys from Rolla have a good article about Tag Cloud. They show how to integrat it using .Net

Creating a Tag Cloud in ASP.NET By Scott Mitchell: http://aspnet.4guysfromrolla.com/articles/102506-1.aspx