SUNDANCE/If you just can’t get enough of the goings and doings of President Barack Obama, can’t wait for the blog posts, Twitter tweets, Washington whispers or even the newspaper and magazine stories about the U.S. chief executive, now there’s help. You can sign up for e-mails from the president. He sent his first one Wednesday. It’s hardly a window on the inner workings of the White House but it is a new way to communicate.