Wikipedia Mathematics Portal

Like most every other internet user, I often end up at Wikipedia.org for one reason or another.  Yet I never realized that Wikipedia offers Portals for various categories, like Mathematics:

http://en.wikipedia.org/wiki/Portal:Mathematics

In addition to functioning as a doorway to the vast amount of mathematics available in wikipedia, the portal also offers up selected articles from the archives, a collection of clickable fun facts, and a Picture of the Month.