HTTP Errors and Is This Site Down?

So you go to a site and you get a HTTP error such as this...

Service Unavailable

HTTP Error 503. The service is unavailable.

So if you would like to check and see if it's just you, or is everyone getting the same error from the site.

Here are some sites for testing...

http://www.isitdownrightnow.com/

http://downforeveryoneorjustme.com/

http://www.currentlydown.com/

http://www.isup.me/

http://downorisitjustme.com/

http://www.host-tracker.com/

Why is My Website Down
WhySiteDown.com powered by Rigor
http://whysitedown.com/

http://www.shoutmeloud.com/check-website-down-or-up.html

http://viewdns.info/ismysitedown/