Total Information Awareness, For One
Jason writes "This guy has created his own TIA program for his electronic transactions around DC. He writes, 'Conceptually, I decided to create a personal TIA program to track my own electronic movements... and to document every single electronically-recorded transaction I've made.' A small vignette into what could be done with your electronic droppings."
There's more info on LifeLog here and here.
nms
Click on the "Click for PNG link".
Then click on some of the icons on his map. It's more involved than you think. Scanned receipts from that location, including what was purchased, and how much he paid for it. It's not just a map, and it certainly wasn't generated by Quicken or MS Money, unless those two programs have gotten significantly more powerful than I thought.