Hi David
Actually, I've started a page:
http://mediawiki.org/wiki/Twiki
Not that I can add meaningful content to it myself ;-)
Hehe, it's a start at least.
The opensource community somehow missed the point where a common wiki markup language would have been a good idea. Now it's too late apparently ...
When I find some solution (other than copy/paste), I'll share it.
Cheers
André