1. The blue 65 cm yoga bouncey-ball, which has been the never-fail crying-stopping-solution in our house for two kids now. Plus, its spherical matte-blue perfection has an eerie alien aura to it. It looks like someone imported our house into one of those computer 3-D drawing tools and put a Phong-shaded primitive in our living room. I call it "unit sphere." Note: filling it to the specified diameter is tricky.
2. Tiny Love Gymini play mat, which we enjoy with more enthusiasm than just "tiny love."
3. Touchpoints - Birth to Three, by Dr. Brazelton of Children's Hospital Boston. And a good family medical book, like the one the Mayo Clinic puts out, as well as the proper thermometers, etc.
4. Do some research on good pediatricians a few months ahead of time. Actually meet with them, and chat with parents.
5. Before coming home, consider stocking your freezer with reheatable meals. Or, see if a friend will ask friends to contribute. In our case (thanks BC!) the cooking favor was paired with a request to please stay no longer than 15 minutes while the family settles in.
ps Re: 1 - Or Gouraud, whatever.