Check out Tag Cloud

From my days with Participate Systems, where we developed an online community platform that had a natural language search engine at its core, I have always had an interest in search technology. And once you start diving into search, then taxonomies, how content is tagged and organized, invariably comes into the equation. I recently stumbled upon this site, tagcloud, which appears to have taken one of yahoo's search apis and built an interesting little tool/web service. Basically, you upload all the RSS feeds that you are currently subscribed to into their site. Then they search for the keywords in those feeds and create a Tagcloud for you. You can then post that custom tagcloud onto your site. See mine in the bottom right corner.

I think it is pretty cool. What do you think?