DD, I for one would probably want to get back in sync with a new official release for one reason.

As for WIKIs, I'm afraid I haven't got round to looking at them fully enough yet. I have toyed with the idea of turning folkinfo into or including a WIKI at folkinfo. In some ways my gut feeling is that if I could encourage the use and get contributers, it might suit the nature of the site, perhaps with articles on the collectors, backgrounds to songs, etc. At first glance, it does seem to offer advantages over having to search for stuff in threads. Maybe this year I'll get round to doing some research...

As for songs in a WIKI, I don't know. One area of doubt would be the structure and ease of searching using facilities such as the full text searches. As far as I can gather, trust doen't usualy seem to be a major issue and on accuracy, with co-operation, it could have the reverse effect to the one SRS suggested. Trouble is, as far as can see, you wouldn't knnw till you tried it...

Would it be possible to maintain a downloadable database via a wiki interface? Or would a user be limited to working online?

I'm not really understanding you. What are you thinking of doing?