Oops, that last tip was listed in the link Rick provided. Other tips on the sheet (for those who don't want the distraction of clicking a link):
BID YOUR MAXIMUM.
KNOW THE BID INCREMENTS.
BE FAMILIAR WITH SCHEDULED MAINTENANCE.
eBay undergoes scheduled maintenance every Thursday nights from 11:00pm to 1:00am PST.
BID GROUPS – use them. (I didn't know about this Auction Sniper feature. Cool.)