i have my site at one.com and sometimes down because of too much traffic (3-4 times in a month which i NOTICED) so it can be something temporary!
Hostgator went down for about 20 minutes last night. Here's the thread on it: http://forums.hostgator.com/showthread.php?t=27201 It's all back up now.
All back up now http://twitter.com/hostgator "We will fully honor our uptime guarantee if downtime for the month exceeded 45 minutes. Looks like about 25 minutes of downtime." http://forums.hostgator.com/may-12-2009-network-outage-details-t49768.html
There was an issue with Customer Access Routers (CARs) at theplanet and hence Hostgator servers were inaccessible. http://forums.theplanet.com/index.php?showtopic=91531 Kailash