Chris Lanier reports that Microsoft has pledged researching support for switched digital video:
We [MS] are working to enable support for the CableLabs SDV Tuning Adaptor for Windows Media Center Digital Cable Tuners, ensuring that Windows Media Center users will be able to access switched content.
Ben Drawbaugh believes a PC-based USB connection should be sufficient to control the tuning adapter, while Chris contends new CableCARD tuners with USB ports will be required. Regardless of the implementation, I seriously doubt VMC users will have the ability to access switched channels this year. For those impacted, the best short-term solution to access all digital programming via PC is by renting a cable-co set-top box and recording programming using SageTV in conjunction with the Happauge HD PVR.