Yeah... but would people know to look for
wikimania2006.org over
wikimania.org? I say we secure the trademark, and try to discuss with the domain owners over who has a right to get the website, or how much it would cost.
Another unrelated question: I still don't see why it would be such a big deal to have both WikiSym and WikiSem, as they sound like they're related, but are unlikely to be confused. It would show more integration, which it seems WikiMedia projects as a whole lack. While I realize that WikiSym isn't connected to WikiMedia (or is it?) I think there would be little confusion, and the name sounds both professional--
seminar is a good conference word that doesn't sound too geeky or beer-drinky [avoiding the pitfalls of "convention" and "meetup", respectively]--and casual, with the second word abbreviated, it appears much more laid back. I'm not married to this idea, and I still do like the name WikiMania a lot, but I also think that WikiSem would be a good choice, or alternative if it comes to that.