Bob's SuperSwiki (a.k.a. BSS) is the preeminent SuperSwiki. Right now (June 2001), pretty much all Squeakers post their project onto good ole' BSS.
To access BSS from within Squeak, download Squeak 3.0 (see Downloading Squeak) and start it up, and use the FIND button in the gold/orange "Navigator" tab popup at the bottom left corner of the screen. (Or go to http://209.143.91.36/super)