I've been in the mood to work on the site in the last week because I got SuperBlogger. While looking at that pluging I discovered K2 by the same team which looks like it will "finish" Joomla. What I mean by that is it will provide Joomla with all the core functionality that Joomla should have to start with. Anyway while watching a video about tips and tricks to do with Joomla I got in the mood to edit my error 404 page to make it nicer looking.

You can try it out by just typing in a page that doesn't exist. Or you can try this link to see if you like it - Error 404