Yes, in the last few months I've seen all kinds of sites be unavailable for a while, for no particular reason. Google is always available though. I'll see (or not see as it were) major sites like slashdot, reddit, digg, etc. not work for a little while.

That downforeveryoneorjustme site looks interesting. I'll have to try that next time.

BTW runrev is available right now for me. Just goes to show...