Oprah Winfrey was at the Comcast Center for a meeting this afternoon and another meeting at Table 31 on the ground floor of the skyscraper. A Comcast spokesman confirmed Winfrey was at the cable giant's headquarters but said he did not know the nature of her conversations. Winfrey's stepping down from her long-running and wildly successful talk show on Sept. 9, 2011 and will then launch OWN, the Oprah Winfrey Network, which will presumably be carried on Comcast. Inquiries to her Harpo Productions were not immediately returned this afternoon. At Table 31, Winfrey didn't eat but sipped San Pellegrino sparkling water as a bodyguard hovered nearby. She met with a man who was not recognizable to our spies.