Ding It’s Up – Website Alerts Via eMail, Text and Twitter
http://www.dingitsup.com/

Ding It’s Up is a free service that alerts you via text (SMS), twitter or email when a website goes down or when it comes back up. We will never send you a text/email unless it is to inform you about a website you requested information for – you can unsubscribe at any time. This has been added to Internet Alerts Subject Tracer™ Information Blog.