Pete Souza is not a name most people recognize despite his fascinating work.
He is currently the chief White House photographer and recently opened up a flickr account where he posts his photos, which are consistently interesting and illuminating. Most people think of the White House abstractly but Souza opens it up and gives it life.
What does this have to do with transparency? Most of the time transparency refers to text (budgets, bills, meeting transcripts), but transparency shouldn't stop there. I think showing visual images of the White House and the President is a great step in opening up the office.
While the account has only been open for a week it already contains a couple hundred photos. Hopefully the account builds on what it has so far and can serve as a visual record of this President and his administration for generations to come.