Notify Mee
notifymee.com
notifymee.com
I may be alone here, but I get rubbed the wrong way when people presume to tell me how invaluable [definition: having incalculable monetary, intellectual, or spiritual worth] their service is. Especially when, you know, it's not.
That whole first sentence can go.
Loonies don't usually use the whois to show up at your house, they can do so regardless.
You'd still have to poll your email to see that whatever it was that you were looking for is back up, some kind of IM coupling would seem to be a more convenient vehicle (or a text message to a cell phone).
Still, it's a nice idea even though the current design looks like an email address harvester, no privacy policy and no 'terms of service' as far as I can see.
If notify mee can't magically figure out that the site I want to visit is down, it doesn't do me much good. (I say magically, because I have no idea how they could figure that out if the site isn't sending the correct response headers)