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Many online form builders let you do this through branching where branching is just simple logic. If a user answers one way show this question, if they answer another way show this other question. Wufoo and Formstack are two form building software that support this. Links point to the feature page on branching/conditional logic.

There's always good ol' GetSatisfaction, but in general I think you can modify existing Q&A software quite easily to acheive what you are looking for. If you want to run your own portal on your own server though, try (Python): http://www.osqa.net/ There's a PHP one too: question2answer.org Also look into this one for a C# version similar to ...

Google Moderator might suits you: Let your audience decide Get to know your audience by letting them decide which questions, suggestions or ideas interest them most. Everyone's voice is heard The voting box at the top of page focuses attention on submissions recently added and on the rise, making it simple and easy to participate. Be ...