Take a picture of things you need save. A receipt, a note, directions, another picture, etc. Snap it, then throw it away. Email the picture to yourself.
This might also work to reduce sentimental things you might collect. Taking a picture can still retain the visual memory, without the actual item. Use your camera to photograph the item, and then let it go. This is a great way to really clean house.
I heard about this cleaning method a while back but it wasn’t until recently I put it into practice. I don’t have my scanner (wow do I scan everything!) and my wallet was getting jammed with receipts and notes. I use my camera phone to snap (or “scan”) and then toss the paper. Easy!