Just adding that I went back to work full time in January 07 after seven years at home and it worked out really well for us . Well - really well - since my husband got laid off, got a new job, broke his arm on that job and has been home for almost 2 months now with a cast.
My son Roman was 3 when he started at daycare - and in the right setting he's done beautifully. He loves 'school', his teachers and I am thrilled with the church's program. They teach him, protect him and love him - and he loves going , playing with his friends and its something that in our case, he really needs to get ready for kindergarten. Just because of the type of kid he is.
Anyway, my kids are older (not counting the teenager) at 7 1/2 and 4 1/2 but they adjusted just fine and I work 40 hours a week. Hopefully next month dh will go back to work as well at 40hrs/week and they'll adjust just fine to that as well
Good luck. Its exciting and scary at the same time