Just a cautionary note.  I read their Terms of Service.  You should also.  Pay attention to Section 2 (Submissions).

They state up front, for everybody to see, that YOU own copyright to YOUR stuff that you put on the wiki.  However, buried in Section 2 of their Terms of Service, is a sentence stating that by uploading stuff to Pbwiki, you thereby grant them the right to use the information however they wish, including modifying it, and including sublicensing the use of it to whoever they want.

So do not put anything in your wiki that you would ever want to make money on yourself.