+1 ^

I've got a picture of me with each of my bikes and the serial numbers on my cell phone, most taken in or beside my garage. Since the phone saves the photo data, including date, it would be tough for a thief to claim a scam. The information inside the seat post is also a good idea and I should do that as extra protection. A stolen bike was recovered at a bike co-op in the area a couple of years ago when someone brought it in for work and the legitimate owner spotted it and pulled his name and phone number out of the seat post.

On a related note, be aware that powder coating or even repainting a frame can obscure serial numbers.