On the issue of wikis I say, WTF? HTMl wasn't good enough for them? I /hate/ the arbitrary new ways they've found for doing the same old formatting.
/me demands her plain old html back
Yeah, I have to agree with Rhys. The "custom HTML" that different web applications out there is sooooooo annoying. What point is there in "competing" on different tags? Just makes the users more annoyed that they have learn something new then remain context sensitive by remembering when to use which "code" where.