Every update of Quicktime, iPhoto, iWeb, iDVD etc. the system will write a new receipt but keeps the previous receipts. Wouldn't it be enough to keep the last written receipt and delete the old ones? If a receipt is meant to tell the system what needs to be updated, why would there be any need to keep this ridiculous 'version history', only the last receipt is needed, isn't it? Or am I forgetting something?