A while ago I found out about a WordPress plugin called WP-Cumulus that shows your site's tags, categories or both using a Flash movie that rotates them in 3D.
WP-Cumulus adds on to WordPress as a sidebar widget, which means it ends up pretty small, and you lose a lot of the detail.
The upside is that the plugin looks very pretty - it spins in 3D and can be controlled by the mouse.
The downside is that normal tag clouds are just regular HTML hyperlinks so with WP-Cumulus you lose some navigability, especially from the point of view of a crawling searching engine. You lose it completely if you don't have Flash installed. It also slows down your page loads a bit.
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