The ASUS Ageia PhysX card should be available in February, according to this article by CoolTechZone.  Still no word on the bus it will use, or an actual date though.
“We are all aware of AGEIA and its desire to bring a PhysX processor for physics processing in order to make games look and feel more realistic. We all want the characters to move and act realistically, and that’s exactly what AGEIA’s PhysX will accomplish once it debuts. However, in order for the technology to work, it requires an expansion card for the motherboard.”

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