You can make tag clouds fairly easily in Flash/ActionScript and JavaScript, and you can make them look much snazzier—flashier, even. However, I don't think these client-side languages are as good a choice as the server-based scripting languages. Why? Because you want search engines to see your tag clouds. Both of these technologies would effectively blind most search engines to the content of your tag clouds. If you do pursue a Flash or JavaScript solution for the interface, consider including the actual tags in a comment block in the HTML.
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