I have ended my theme testing using Demo Site 3 and it is once again available for anyone to use.
As usual, if interested read the page on How to Use the Demo Sites.
So go ahead and try out your WordPress install and site setup or testing or what ever you wish. Keep in mind that the demo sites are generally reset within 24-48 hrs or so after I notice someone is using them.
Follow Tim on Twitter @tl1000rzx2
Or check out my other blog: THE Tablet Test Server