By Anne Holland, PresidentLast week while I was in San Francisco for our B-to-B Summit, I also grabbed the chance to talk with Matt Ackley, eBay's VP of Net Marketing. I met Matt at a NorCal BMA luncheon. He's funny, honest and smart -- especially about search marketing. Here are highlights of what I learned from him:o Why eBay buys the keyword 'eBay'"We actually buy the word 'eBay,' which is very, very unintuitive. We've done numerous, numerous tests on this, because every time I go and say, 'We buy the keyword, eBay', people come back and say, 'You're an idiot. Why are you buying the keyword eBay? Everybody knows eBay. You don't need to buy the keyword eBay.'"We have proven...