From the 990 FAQ, "The DVI circuits are a pure switch" - so I'm afraid that the 990 will not convert analog video sources to digital (or vice versa).

Converting DVI to component would be costly and undesirable - a digital video source should remain digital until it reaches the digital display, and if your display isn't digital I'd recommend staying with an analog source. Converting component (or other analog sources) to digital may eventually start showing up (I think JVC has a receiver in the works that will do this), but to do so without compromising the quality of the signal would be expensive.