Tweet Topic Explorer is a tool that visualizes the topics of any given twitter stream. The example screen shot above is from my twitter account, @jakprpro (please follow me there if you don’t already!)
Circle size is proportional to the frequency of the word’s use. Colors are used to group words most often used together.
The live image is dynamic. Mouse over any word bubble and it is enlarged; click and a stream of tweets to the right are narrowed to those with that word.
This free tool can be used to analyze the tweets of any twitter user ID, making this useful not only to look at your own tweeting but also that of competitors or those you may want to emulate.