The HapMap Citation Cloud.
I stumbled across this Thomson ISI tool the other day, and I had a little fun with it. It creates a “citation cloud” of whatever paper you select. One can see all the papers that your paper cites (the “back” set), and all the papers that cite your paper (the “fwd” set). At the end of each curvy line is a paper. After zooming in and out and dragging the image here and there, I noticed a big fish composed of a cloud of over 1500 papers. :)
