I created http://duringconstruction.com/ for reasons such as this. Naturally it has to be a little more generic but you can get it up by only changing DNS. It gives you all of the benefits while wasting as little time as possible.

I think the page you put up has personality but there really wasn't anything to hook me into giving up my email address. I think being completely stealthy and getting lots of email addresses and/or is impossible or at least very difficult unless you have a high profile personality involved. Without that I need something to pique my curiousity.