Simple forum software for user feedback?

I want my users and causal surfers to be able to leave feedback, ask questions and chat with me or each other. I need simple forum software and/or hosting that would let people post without registration, see recent posts and search for older posts. I want to minimize management to a point where I simply review comments. I also want to be able to move the forum later on, so I need location transparency (dns cname's), data portability and user account portability.

  Suggestions?


  So far I looked at:

Google groups (registration required) JS-Kit Comments(really nice and lightweight but has no search and no way to collapse threads) PHPBB (rumors have it it's full of security bugs so I don't even want to start worrying about applying security patches on time) vBullitien (seems very complex to setup/customize and also needs to be maintained) getsatisfaction.com (registration required, very loud interface, little portability/transparency)