Yahoo! is close to making Microsoft's Bing its search provider; the deal is likely to be announced this week, and seems likely to be based on a revenue share, not on a big fat check upfront, as some at Yahoo had hoped. “Yahoo's request for an upfront payment (it’s said to’ve asked for several hundred million), in addition to revenue guarantees that would amount to billions over the course of the deal, caused a breakdown last week in the on-again-off-again talks. But they were revived late on Thursday, according to executives with knowledge of the situation,” reports Advertising Age.