TiVo has updated the version of TiVo Desktop for Macintosh to 1.9.2. This version finally promises compatibility with Tiger (OS X 10.4). Previously, you had to use a separate utility to get TiVo Desktop to work on Tiger, but now it installs and works without a problem. The notes claim it won’t work with an Intel-based Mac yet.
Still no TiVoToGo, but this clearly means that attention is being paid to the Mac platform, so hopefully that’ll be out soon.