Just a question that popped into my head while I 
was updating my cel records.

How does everyone keep records of their cel 
purchases? I started a spreadsheet not too long 
ago that lists all my cels that I still have 
records (reciepts etc) for, with a thumbnail 
embedded in it for each cel. I imagine that 
dealers have their own business oriented version 
but what about those who just collect?  

I would also think that this would be invalueable 
when a collector needs to sell a cel so they 
don't have to try to remember what they paid for 
it.