Ahh, Packing List!

I have a fine packing list. For great convenience, my list is a spreadsheet on my PDA. It's easy to check items off as I pack. My list includes items I might need occasionally (passport?), and also errands to do before leaving (make sure stove is off). Whenever I'm on a trip and find I forgot to bring something, I immediately add it to the list. I'm not a very organized person, but the satisfaction this list brings impels me to keep it useful and to use it always.