We changed our hosting OS, and can now integrate Perforce version control into UDK. This will be a big step for development over the summer. However, while we were already working on improving the site, the OS change seems to have screwed with a number of files (not to worry your logins and info from the forums are fine) and as such most features are either down or working improperly, as well as consistent visual bugs throughout the site.
We are working to fix all of this, but it will take time, we apologize for any inconvenience.