Doerr, Rubenstein Among "Giving Pledgers"

Forty billionaires today agreed to donate at least half of their fortunes to charity, as part of "The Giving Pledge" program launched earlier this year by Bill Gates and Warren Buffet. Among those to sign on are venture capitalist John Doerr (along with wife Ann) and buyout king David Rubenstein. It's not a legal contract -- described as a "moral" one -- but each participant is expected to write a letter explaining their decision to pledge. A bunch of them already have been posted online, but neither Doerr's nor Rubenstein's are among them. While we wait, here is the letter from Blackstone Group co-founder Pete Peterson:

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