Google and Yahoo released excerpts of the pact covering their search advertising partnership that keeps secret financial terms and the extent of other ties between the two.

Under the deal, Google would supply Yahoo with advertising services (ads from adWords Clients) to run alongside Yahoo’s Web search.  Yahoo runs the Web’s second most popular search service, second to none other than Google. Google and Yahoo have sought to portray the partnership as a non-exclusive arrangement. But the contract is heavily redacted in an area that covers “other business opportunities” and both companies are  silent about how the sharing of user data between the partners could actually affect the privacy of Yahoo users!!

While the contract reveals details of previously disclosed plans to make Yahoo Messenger and Google Talk work together, it revisers four of the five other points in the “other business” section. Yahoo has said it expects to generate an additional $250 million to $450 million in additional cash flow in the first 12 months after the agreement goes into effect.