Was checking out the new WordPress Foundation site and saw in the sidebar it said their header image was generated with Wordle. Curious, I checked it out and found Wordle is a Java Applet that creates a graphic word matrix based on the number of recurring words in any RSS feed. There are a bunch of fonts and layout algorythms you can choose from and you can create custom color palette as well. Here is one I generated from underblob.com’s RSS:
Pretty cool!