Its about damn time someone setup a wiki! I just hope its not too little too late.
For the format adjustments, its easy to convert BBcode tags to wiki markup with batch scripts, or even manual replace all, and general editor's review.
Permission is probably a minor issue and in general if something is contributed to a site as a community resource it can be copied to other community sites with a disclaimer giving the author a contact point to have it pulled if they don't want it mirrored. Too, since its a wiki the original author could delete the article text, although only a sysop can delete the actual article itself. Keeping tutorials synced across multiple sites is also an issue, on a wiki anyone can edit it and in most cases the original tutorial can become out dated in short order.
Sorry to say I can't help with the wiki, I barely have time to work on OL's wiki...maybe if it were setup a year ago...
-Burn
Lead Designer and Webmaster,
Openlancer Project