I do tech support for several groups within my family. They usually have a document or notebook of questions for me. They often record my advice, but then ask me again later. Some communications are by email (nice record for me, although they never think to search). Some sessions are in person, usually with a followup email from me for the record. Which they forget about.

I'm not trying to force them to be more 'professional', but I would like to streamline my support a bit, and give them a place to look for past answers. Some of them would like a standard place like that, rather than reasking me the same questions.

The solution has to be free. And web-based, although email-in for questions would be great. I'll be doing most (all?) updating of the system. Mobile/iPhone access would be nice, but not required.

Ideally, a system with topics and responses would be good, but I'd need a way to promote one response as 'the answer'.