At Wordle you can generate “word clouds” from text that you provide, or from anyone's bookmarks.

What you see above is from my delicious bookmarks. Your generated cloud will have larger type for words that appear more frequently in the source text. You can tweak your cloud image with various fonts, layouts, and color schemes. The images you create with Wordle are yours to use however you like. You can print them, or save them to their gallery to share with others.