Much that has been published to date on wiki use in college classes either explains what wikis are or speculates on what they might accomplish; few studies analyze how wikis have and have not worked when actually used in college classes. To this end, we report on a study conducted over two quarters, with three classes and two teaching teams in a program that serves non-traditional students. We studied our use of wikis as a learning tool (helping students develop academic writing skills) and as a teaching tool (allowing us to distribute information, promote collaboration and build a sense of class community). We also evaluated one teaching team's ability to develop their use of the wiki and disseminate what they learned to another teaching team.