If you're interested in daycare centers, I can highly recommend The Learning Experience. It's right off of exit 34 off of Route 495 (or you can take exit 31 off of Route 3 -- literally 2 minutes from the CrossPoint building). My son is 26 months old and has been there since he was 3 months old. He has so much fun and loves his friends and teachers! Good luck with your search.
Re: Daycare recommendations - Chelmsford area?