All analog TV tuners, be them in televisions, VCRs, DVRs, or computers, will cease to function for broadcast stations unless a digital converted box is inserted in between. However, this switch over only affects over-the-air channels you'd pick up with an antenna, not cable or satellite TV services. It's up to the individual cable/satellite companies when they want to make the switch, and what options they will make available. So far I have not heard of Comcast, Time Warner, and the rest setting any definitive timelines so you should be fine for the near future.
Hope this helps,
I have an ATI All-in-wonder 9600 graphics card operating windows xp with all comparable requirements to be a 'fast' computer able to do anything I want.
In 2009 when the analog signal is switched to digital completely by the cable company, am I going to be required to add a 'set-top-box' to my computer in order to watch and record tv with my existing set-up?