A Numberphile video about the different types of auctions, their benefits and drawbacks, and how best to win Ebay auctions. Relevant for our hobby I think, particularly the part about the release of information about value in an auction.
This is actually quite interesting, personally however I'll always stick to my tried and true method: Shake up the bid by bidding my very max at the last few seconds and let eBay do the rest. After being on eBay for many years I've become a decent sniper of bids.