This should probobly be its own topic but,..
I would rather have a tooltip option. It would be neat if a little tooltip would popup with the first paragraph or so of the page you are linking too. If nothing else, this would be very cool for links to wikitionary.
It could use something like [[Def:<word>]] and a link to that wikitionary would be created with a tooltip that had a quick defenition of it.
It would add quite a server load though.