All cable supplied boxes, including DVRs, are required to have an active FireWire port. There are hacks available which will allow you to connect that FireWire port to the FireWire input on your PC and capture programs that way. However unlike TTG the capture is live, which means the program has to be playing and takes realtime to transfer to the PC. It's almost like capturing using an analog capture device, accept that youre capturing the original digital stream so there is no conversion loss and you can capture HD programing.
A search over on AVSForum should yield all the info you need to set this up.
A forum community dedicated to TiVo digital video recorder owners and enthusiasts. Come join the discussion about programming, streaming, content, schedules, home theaters, displays, models, reviews, accessories, classifieds, and more!