I have implemented in the Website www.vsone.de a tag cloud for a new kind of session navigation. As part of web 2.0 tags are used to give a overview of the content. It does not replace the classic navigation. The tags are sized by some logic, matter usually based on the count of it.
The problem is how to size font of the tags.
| sample | Site | pro/con |
| px | style="font-size: 36px; | Flickr | can not be scaled by user |
| % | style="font-size: 129%; | weblogs.asp.net | canbe calculated by logic |
| em | <em><em><em> | technorati.com | Amount of html |
| em | style="font-size: 1.77em | www.vsone.de | Mozilla issue |
| class | class="CommonTag1" | weblogs.asp.net | behind uses % in css |
| xx-small | size="xx-small" | | |
If somebody have comments and additions : feel free!
Scott Guthrie have written some sample application.