Spam Visualization [spamvisualization.net] contains a small collection of beautifully stylized data visualizations based on the data retrieved from the Spam Catalog Database.
The available data visualization techniques include a Bubble Size Quantity Grid (sorted by date, size or IP number), a Word Frequency Graph (sorted by count, alphabet or length), a Top Level Pie Chart (the circles show the ratio of the toplevel domain endings in emails and link URLs), some IP Number Glyphs, and a Time Frequency Bar Graph (shows the spam income of the last seven days, with color depending on the amount per hour.).
More visuals are available at Flickr. Thnkx Kim.