You can, and I have been doing so. It's a multistep process, though.
First you have to pull the show onto your computer using TiVo desktop. Then you need to remove the DRM wrapper using Direct Show Dump (google it). That'll leave you a good .mpg file you can feed into any of the recoding programs talked about here. I'm still using the PSP one from Videora, PSP video 9.
Works great, I can convert and take a couple shows with me to watch while my code's compiling at work.