Google Documents

What a wonderful thing!  Here are some things I have used it for:

Christmas gifts for family members (wish list, where it can be purchased, prices, what I've paid per child etc.)
Organizing an 11 year old scout camp for about 80 kids
Organizing a music theory test day for about 500 students
Planning menus with Jeff for extended campouts
Organizing church music (Sacrament meeting, church organists, and choir music)
Volunteers for elementary school for yearly fundraising auction
Planning vacations
Coordinating cub scout lists between packs