Okay, this is incredible. If you're running a small group -- less than half a mill a year -- that's most of us, right? -- then you should get this book. I just bought it. The very first chapter talks about figuring out your average and mean donations, and top 10 donors -- and GUESS WHAT??!! I have an Excel sheet for you that will do that for you automatically! Yours free if you buy the book from this link.