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So much for old pals. Mark Cuban, the owner of the Dallas Mavericks and billionaire founder of Broadcast.com, was Jason Calacanis's original backer at Weblogs Inc. And Cuban had agreed to show up at Calacanis's latest venture, the TechCrunch40 conference, as an expert judge. Cuban's still listed on the site, but he's a no-show at the conference, attendees say. Why? Apparently he's taping the ABC reality series "Dancing with the Stars." He's surely having a better time being critiqued for his soft-shoe technique than debating the merits of startups like Orgoo, Kerpoof, and ZocDoc. Once again, old media trumps new media.