Teachers, these word and tag cloud tools have some great learning application for engaging reading comprehension activities, compare and contrast activities, etc. Students find them fascinating, which rubs off on curriculum content.
Tagul is an interesting service. You can feed your blog’s content to it and get a tag cloud. You can even have the word cloud appear in shapes. Here’s my current tag cloud, which is interactive. Clicking on any word in the cloud will bring up every post here at tt.us that is related to that word. And, finally, the cloud should rebuild automatically every 12 hours.