Yeah, we're having some sort of bizarre server issues - hopefully they'll be fixed ASAP.
It's funny, I can see them on my end, even after flushing the cache and doing a shift-reload to force a new reload from the server, so I know they're still up, but several other people have noted that they cannot access them. I'm a little pissed with the server. This is twice in 6 weeks that we've had server problems that lasted more than a day.
Update - Now I can't access the site at all, which presumably means that it's been completely taken down so they can fix it. I hope. Not at all happy - we've only been on the new server for two months and this is the second major screwup.