You do know you can do anything you want in a wiki page? Why does the choice of technology limit what you can do?

Trust me, you'd rather edit stuff in MediaWiki than Midgard ;-)

You can make a wiki page a portal (i.e. a jumping off point to other places), embed RSS feeds, put images in, whatever you like. If it scratches your itch, do it.

For example, http://wiki.maemo.org/Mer is a MediaWiki page; as is http://en.wikipedia.org/wiki/Main_Page. You can just get started, and put as much style and design into it as you want.