As far as I know, there's nothing coming up that'll allow you to view/record encrypted channels on a PC (or Mac). There are CableCARD tuners available, that can tune all digital programming, but they are only available in fairly high-priced systems (~$1200+) and can't be purchased separately (and even if purchased separately, it wouldn't work). It's some bullshit IMO.
If you're willing to use a cable box, there is a device that'll take the HiDef output (via component cables) and allow your PC To record it... but my feeling is that having the cable box kinda defeats the purpose.