I accidentally edited a FlexWiki topic down to practically blank because I thought I was working with my local test installation, but after saving it I realized I had done it to the "real" topic on the FlexWiki site itself. I caught on really quickly to the virtues of Restore Version. Whew! I also changed the wiki.css color scheme on my local instance so I wouldn't make this mistake again.
I'm evaluating FlexWiki for internal collaborative documentation in my department, which is Office of Financial Management in Washington State government. I subscribe to the FlexWikiUsers email list, so if you want to contact me, just post to that list.