Anything the Desktop team can do, the KDE team can do as well, it seems: following on the heels of last week's GNOME Test Day, today is KDE Test Day! If KDE is your desktop of choice, today's the day you can join the KDE packagers to test out KDE in the upcoming Fedora 18 release and make sure it's working well and smoothly polished.
Full test instructions are on the page. You can test with a live image, which you can download from the page - you don't need to install Fedora 18 at all. You could also do much of the testing in a virtual machine.
We also encourage testers to join the #fedora-test-day channel on Freenode IRC: members of the Fedora QA team and KDE team will be around to help you with the testing process and also to take a look at any bugs that you might find. If you’re not a regular IRC user, you can find instructions here, or you can simply click here to join the channel (chat room) through a Web front end.
Even if you’re not a Fedora user, please consider joining in - as with GNOME, Fedora's KDE is a clean build from upstream and fixes for any bugs found at the Test Day will land in upstream KDE for all distributions that use KDE to benefit from. Please do come by if you have time! Thanks.