K.
V.,
We signed up for gonannies.com and it was worth it but we had narrowed down to 3 candidates when I decided to advertise in my small local paper & found someone we absolutely loved. Just be prepared that for 3 kiddos full time will run $375+/week in the suburbs. There are many Nannies to be that work at reputable daycares that have small children of their own who would rather watch your kids, if they can bring their's along. We had two such cases where the candidates had a toddler or a 6 yr old and we actually had the candidates bring their children to the interview so we could meet them, too.
Hope this helps!