There are some GREAT examples of educational wikis to peruse here. So many ideas and different ways to use wikis. Take a look and turn up some new ones that you haven't seen and find some new teachers.
Liz Kolb tipped me onto this gem that I will look at. She says it does things just like Jott - it has several features for iphones. I'm going to look at it and let you know how Jott and reqall compare -- if it is worth the $3.95 a month for Jott to work w/ RTM and Google Cal.