I always have ~ 50+ tabs open. If one doesn't work, then I figure it's down. If they all don't work, I figure its on my end (or in the path to my DNS).

If it's really mysterious, I would do a tracert.

If it's really, really mysterious, I would look at the Internet Traffic Report - http://www.internett....com/namerica.htm

Thanks.

Cheers,
Scott.