RhinoFish

Yahoo Can Grow Faster Than Google

Since it's the advertisers that spend the money that Yahoo would make in this arena, perhaps you should chat with a few of them about how well the Y system works for them. Generating ad revenue does require satisfying advertisers needs. All other aspects are interesting and newsworthy / blogworthy, but the essential part of creating a Y advertising distribution cash machine is where I suggest you focus more.

The Lawsuit That Could Cripple Google: Will American Airlines Ruin Everything?

"I would assume that a very large portion of that – upwards of 90% -- come from marketers competing on keywords that consumers associate with their competitors."

As a Pay-Per-Click Advertising Consultant, I'd suggest you research your assumption further, keeping in mind that it's "pay per click".