Just released on MSDN downloads, a nice little article for those of you who want to get acquainted with Wikis in WSS 3.0 a bit more:
Windows SharePoint Services 3.0 includes a new wiki site template, providing a low-maintenance way to capture community knowledge. It can be used for brainstorming ideas, recording internal process information, or gathering data from the field. SharePoint wikis are quick to edit and make it easy for inexperienced authors to contribute. Built-in versioning controls enable you to easily rollback changes if people make mistakes.