While we're weighing in, I'd like to support Erik Moeller's candidacy. Though I don't agree with him on all specifics, I trust that he's sincerely and idealistically committed to the core mission of the Wikimedia Foundation. As importantly, he has a long track record of getting important things done, being the primary mover behind getting both the Wikimedia Commons and WikiNews up and running. Both involved complex combinations of leadership, policy development, and community support, and have turned out to be our two most successful recent projects.
From the point of view of relations with overlapping communities, he has significant credibility with the broader open-content community. He's been active for many years in a variety of forums (I first ran across him at kuro5hin, and he ran a well-known copyright-reform blog for years), and his work with the Wikimedia Commons in particular has made him known in open-media circles. So having him on the board would help cement our alliances with the wider group of people who have similar aims.
There are a number of other candidates who I think would make good board members, but Erik stands out as having a proven track record of getting complex but important things done, along with a high level of credibility in a wider community.
-Mark