I have recommended Stikipad as an inexpensive host wiki service for the last few years. As far as I can tell, the owners of the service have abandoned it since June and it’s performance is degrading. If you are using it I highly recommend migrating your stuff to another site before it goes away. Such is life with using start-up web-based services.
Here are a few alternatives:
- Google Docs (free, wiki-ish, web-based, Office clone)
- PB Wiki ($500/year for up to 5 users)
- Wikispaces ($50/year for one wiki, unlimited users)
- Confluence ($500/year for up to 15 users)
- SocialText (Free for up to 5 users, call for pricing otherwise*)
* Come on SocialText! At least put entry level pricing online.
C. David Gammel, CAE 
Great list of wiki-like options. I’d also suggest Central Desktop, free for 5 team members according to http://www.centraldesktop.com/pricing. Would love to hear your thoughts or experience with that platform.
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