This from my wife:
Wordle.net is a service that turns your tag cloud into an image. The following is the image generated from Cindy’s del.icio.us tags. I saw this a few days ago, but I could not figure out how to use the tags from my social bookmarking system in a way that would generate text size differences. Seems to work great with del.icio.us.
What would be cool would be an independent app that would aggregate public tags across multiple services and then could be shared. What would be REALLY cool would be such a service that allowed access from the core aggregator.