New White House site JAN 20 2009
Several readers have noted that The White House Site has already been refreshed to the now-familiar Obama look-and-feel. It's even got a blog on the front page. Will there be a Twitter account? The Wikipedians have been busy too: Obama is listed as the current President on the President of the United States page.
Update: Oh, and all of the third-party content on the WH site is licensed under Creative Commons. Wow.
Update: This appears to be the official WH Twitter account, former updated by the Bush administration but now helmed by the Obama folks.