FlexWiki 2.0 Beta 1 has been released! A host of bugs have been fixed and one major new feature added. All features but one from FlexWiki 1.8 should now be working, including RSS feeds, newsletters, and the administration pages. Additionally, a new security model has been introduced (read more at http://www.flexwiki.com/default.aspx/FlexWiki/FlexWikiSecurity.html\).
The one thing that isn't working right now is the SQL Server provider. If you store your content on the filesystem (the default), you don't need the SQL Server provider. It will be reimplemented in Beta 2.