Here's a wordle tagcloud for this blog. (through Patti Anklam) You can find the words community, practice and domain as well as facilitator/facilitated/facilitatitive/facilitatorobot.... As well as some of my stopgaps like interesting, use, good, ... It seems to overrate the last content, my last blogpost was about LinkedIn and LinkedIn stands out as the main topic.
Anyhow, it is a fun tool because you can either enter a list of words, a delicious user, or a URL of a blog or website. You can choose the font, the colors etc. You can not create a .jpg file, but you can print it or turn it into a pdf.
Here's another one for my Dutch blog: