While Microsoft has yet to come up with a search engine that wows consumers, it has successfully wooed Wall Street with its push into online advertising. Alas for Microsoft, it's losing a key dealmaker. Bruce Jaffe, a top corporate-development executive who helped engineer Microsoft's $6 billion acquisition of aQuantive and its $240 million investment in Facebook, is leaving the company. He's been interviewing around the Valley, but last we heard, he's decided to form his own startup. Anyone have more details on what he's up to?