Steph,
That was the site I was looking at, actually!
I know friends have found their nannies out there.
I'm struggling to find an actual nanny, rather than someone that can "babysit" a few days/week. I basically need someone there 7-5 everyday. It looks like it'll take time, but this site will be huge.
What do you get with your subscription? We're not quite ready to look yet (I'm not due until June), but I've been poking around.