J.R.
Dear SK, Some thoughts:
1. I would also try word of mouth. The best nannies are usually passed around among friends and acquaintances.
2. I would go to your local church, synagogue or mosque and look for notices or post notices.
3. I would also look at postings at places where children frequent -- gymborees, community centers, parks....
Once you have some options:
1. The references should be excellent. Not lukewarm. Lukewarm means someone gave not happily. They should have at least 3 excellent references.
2. Preferably, there should be at least one family with whom they worked more than one year (that is the family did not want to let her go).
LASTLY AND MOST IMPORTANTLY, TRUST YOUR INSTINCT. IF SOMETHING BOTHERS YOU, DON'T HIRE HER.
GL HTH. jilly