As some of you may remember, I made an attempt several years ago to map my deviantART friends list. Last week I decided to revisit this problem and, using the original data from 2005, achieved this result.
This computed in approximately 10 minutes (~2500 iterations) on a 1.7GHz Pentium M laptop, with 512MB of RAM.
Edit: Click 'download' to see a version which is big enough to read. It's only about 300kB.
Edit 2: If you're at all interested, you can read some of the history of this project in this journal entry.