Phils GM Ruben Amaro Jr. spoke with reporters for about 15 minutes a couple hours ago. We'll have much more on the Lidge move in the paper tomorrow. For now, though, this quote from the GM should suffice.
In a nut shell: The Phillies felt like Lidge's stuff was not his stuff as old. For a short time period, when he saved games on four straight nights, the stuff was there. But against the Dodgers, it wasn't. The slider that Rafael Furcal hit for a home run was flat. His velocity was down. The Phillies were convinced that the knee was the problem for the inconsistent stuff. They met this morning, made their decision, told Lidge, explained to him their rationale, and now Lidge is at a doctor's appointment in Philly, where the team does not expect anything serious to appear.