David Letterman is near a deal to continue reading Top 10 lists on CBS for another three years. The network is about to re-sign the Emmy-winning talk-show host to continue hosting Late Show until 2011-12, sources said. The agreement will represent a two-year extension on his current contract, which expires in 2010.

The decision to lock Letterman in for a longer period comes as rival NBC makes dramatic changes to its late-night lineup, moving Jay Leno to 10 p.m. in the fall and the naming of Conan O'Brien as the new host of the legendary Tonight Show. During his first week on Tonight, O'Brien beat Letterman in the ratings, though the gap between the shows shrunk as the week progressed.

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