We're looking for something simple, in the style of all Google's help sites (e.g. http://mail.google.com/support/) - basically a simple CMS, with categorisation and automatic generation of multiple levels of index pages, search, "did this help" style widgets for feedback, list of most popular articles etc.

What I'm _not_ looking for is a GetSatisfaction/UserVoice -style "community-powered" support.

Not rocket science.. but surely a common problem. Anyone know of anything ready-to-go?

Cheers! -- A