We use a pile of different wikis internally - it's sometimes like
every department has a different one. I need to be familiar with
MoinMoin (our own office wiki), MediaWiki (of the "someone installed
an old version somewhere then left the company" sort, and no-one
actually runs them as such), UseMod, Trac ... I'm likely to be
experimenting soon with MediaWiki internally and possibly for customer
liaison.
- d.