It allows you to put a maximum bid on an item. You still start off at the lowest bid usually $1.00 above the last bid). Then as other bidders place bids ebay automatically bumps, on your behalf, to the higher bid up to your maximum (again, usually in $1 increments). Be careful though as many times people get into a bidding fenzy and end up paying way too much for something.

Oh by the way I read somewhere about a bunch of construction guys that only wear kilts at the job site. And not the UK workman type but tartan. I think somewhere in Calif.