TiVo Desktop v1.9.1 DOES work under Mac OS X 10.4.2
Xlr8yourmac has confirmation from several readers that Apple's Mac OS X 10.4.2 update restored the ability to use the Tivo Desktop software, which had previously stopped working under Tiger.
TiVo Desktop v1.9.1 is still listed as unsupported on the TiVo download page, but it seems you shouldn't let that stop you from using it. One reader says "whatever was causing the problem has been fixed in the 10.4.2 update. The software works just fine now (iPhoto sharing and MP3 sharing -
still no .m4a or .m4p, which I worked around via AirPort Express and a Keyspan remote)."
Guess that homebrew solution wasn't needed after all!