Ooops! We included the wrong url in the link to the Learning 2.0 Wiki. Use this link instead:
UCSC Learning 2.0 on PBWiki.
We've also updated the original blog post so it should work correctly now. If you tried clicking the link to the wiki and couldn't figure out how to edit it, you're not alone. The updated link should take you to the wiki with "write" privileges so you won't be prompted for a password when you click the edit button.
Sorry about that!