So now, whenever I buy something, I take a moment to take a snapshot of the receipt with my iPhone and then upload it to Evernote (using the Evernote app, which makes it quick and easy).
As part of this, I’ve gotten in the habit of shooting photos of all of my receipts and/or scanning most paper documents that come across my desk.
I’ve written in the past about my desire to transition to a paperless personal financial system.