A.H.
One thing I did this year that gave me great peace of mind was create a one page document called "IMPORTANT STUFF". On it, I included the location (physically and on my computer) of all important identification (birth cert's, etc), financial, insurance, trusts & estates, medical, & mortgage information. I included the names and phone numbers of my closest family members, nanny, son's school, attorney, accountant and financial planner, and social security numbers for myself, my husband and kids. Then I gave a copy to my husband, mom, my dad, and my sister-in-law. This way, if anything ever happens to me they will know where to find the things they need.
Also, I have created a written "Babysitter's Guide" including everything a babysitter needs to know about my house and my kids. It has instructions for operating the television, the kids' daily schedules including nap routines and food preferences, and emergency contact information. It has saved me a TON of time when ramping up mew sitters, and my kids are thriving from the consistent routine. Happy organizing!