Bono has been making the rounds in Europe this week meeting with world leaders with Microsoft founder Bill Gates on behalf of Bono's ONE organization.

Gates writes on his blog, "The two of us are meeting with government leaders to encourage them to renew their commitments to fund development assistance programs that help the world's poorest."

ONE is part of a coalition of 650 civil society organizations calling for greater transparency in the sector. More than 160,000 European ONE members signed the petition calling on European leaders to deliver strong laws -- following a successful campaign by ONE members in the U.S. to pass a similar law.