Any suggestions? A sample database schema may be: id | product name | manf | wheat free? | other info | source
Have you looked at the webmin UI for mysql management? That is a sort of template you could consider for what you are doing.
Another thought is... do you need the info to be immediate real-time? What if you exported the data into text, posted that to a wiki, and then imported the updates to the wiki at some interval (daily, 4-hourly, etc)?
I might be reading your request too literally, but I kinda cringe at the idea of a "community" making mass edits to a database.
Most languages come only with a limited number of bindings for databases out of the box.
The best solution would probably be to install MySQL on a server, import your data and install PHPMySQL for the web admin.
After a week of looking into this problem I found that there is an opportunity for a startup wanting to fix this problem.