During the George W. Bush administration, the government argued that White House visitor logs were not subject to the FOIA and refused to disclose them. A lawsuit over the issue was filed -- and was still moving through the system when Barack Obama took office. Obama settled the lawsuit with the White House agreeing to make the Visitor Log's public after a certain period of time, but the White House did not concede that the logs were releaseable under the FOIA.
Judicial Watch, not a party to the settlement, then filed its own lawsuit for visitor logs (the logs are maintained by the Secret Service). A district court found that they are subject to the FOIA and the administration appealed. The appeal is now pending and last week was argued before the United States Court of Appeals for the District of Columbia Circuit. Law.com has a summary of the argument, and a roster of who's on what side of the issue. An opinion is likely in a few months.