Don't worry guys, this message was posted on the site's blog. For some reason, some can access the site, and some can't:
Website Error
Last night our DNS provider screwed up meaning no one could access the site last night between 10pm and 2:30am EST. The error is corrected and don’t worry, XTube is not going anywhere. As of this blog, there are still some connection errors so somethings wont work correctly until all the server errors are cleared, believe me we are just as frustrated as you are about this. We are working on it as I write this and we should have it all sorted out and back to normal shortly.
Sorry for the trouble and we will keep you updated.
Stay Horny My Friends!
Edit:
Looked on the sites forum, and it is fixed - just not for everyone. Staff member posted this:
Time it takes for you to see the proper site, depends on how long your ISP caches resolutions on your local DNS server. Sadly, continually re-querying for xtube.com likely will encourage your ISP to keep the old (erroneous) result cached. Try on 3-4 hour intervals.