Resolved: Sitebuilder down!
Currently there is a glitch causing the sitebuilder page to not work. The page is down indefinitely. We will try to get this back online as soon as possible. Our apologies for the inconvenience.
Update 22-09-2011: As it looks now the sitebuilder will be online again tomorrow (23-09-2011). We will keep you informed through the announcements.
Update 23-09-2011: The sitebuilder is online again.