My new Mediawiki skin is almost ready to be used in anger. The most difficult part has been building in Internet Explorer compatibility. The latest version is visible on my wiki.
I spent several hours last night tweaking my skin to make it work with Firefox (yay), Safari (yay), and IE (boo). IE was by far the most difficult, with many little tweaks required to get it just right.
I want to spend some time using the skin myself before packaging it for download. I also want to port it to WordPress (and possibly Gallery) so my entire site can have a consistent look.