The tech buzz this week revolves around Crossfader, apparently some sort of new electronics arts-related service coming from Microsoft. Microsoft blogger Robert Scoble kicked off the rumors with this cryptic post, and the bloggers took it from there. Greg Yardley spied a post on an upcoming conference web site that described Crossfader as “a new online educational and collaboration community for electronic artists.” But that text has since disappeared. The intrigue continues.