MSN adCenter Open Sign-up Now, Um, Open!

Been wanting to try MSN adCenter, the new program allowing you to buy search ads directly from MSN? Until now, participation has been by invite only. However, the open sign-up period that Jen previously mentioned would happen today is now live. Sign up at MSN adCenter from now (9am Pacific) through the next three hours. Open signup is supposed to close at noon Pacific time.