The Obama techies had their fingers on the switch on Tuesday, and at precisely 12:01 p.m. Eastern Standard Time, they threw it. The Bush administration’s WhiteHouse.gov underwent a Cinderella-like transformation and joined the Web 2.0 era. There’s a White House blog now, if you can imagine that, and a page that will host video of the president’s weekly address to the nation. And you can sign up for e-mail alerts. Those are all a step up from the old Whitehouse.gov, but the most substantial change is the addition of a page that will display new laws awaiting the president’s signature.