For example, if you're a single-tuner TiVo Series2 subscriber, you'll need to put a cable box between your wall connection and your TV. But since TiVo has updated its IR blaster database to control Comcast's equipment, you can tune the cable box via the far superior TiVo remote. If you're a Series 2 dual-tuner customer, however, some of those dual-tuner channels will no longer be viewable. This is because you have only one input on the TiVo, which means you aren't allowed to have more than one cable box connected. (Lost your IR blaster accessory for TiVo? The company will sell you a new one for US$7.)

As cable companies push to achieve an all-digital world, the analog versions of existing channels are fast disappearing on some cable systems. This is happening because the cable operators are aggressively seeking ways to free up bandwidth for high-definition broadcasts and for additional programming channels. They are also interested in finding more bandwidth for services such as games, voice communications, and interactivity. In the end, consumers will gain more access to digital services--and cable companies will have more services to offer to consumers.

It's not all bad news: Customers who have a single TV in their home, set up in a straightforward, traditional arrangement, might (depending on the service) even get a little more for their dollar in the switch to digital. But enthusiasts who have complicated entertainment setups--and people whose homes contain multiple TVs--will feel the pinch.

Cable companies are pursuing two main strategies for freeing up bandwidth. Whether you're affected by either of these depends on a mix of where you live and what company provides your cable.