Without the extra software you can listen to Music and watch Photo's from your Mac.

To Transfer videos between your TiVo and Mac (MPEG-2 and .tivo files only), Burn DVDs of your transferred videos, Convert shows for playback on your iPod, Blackberry, and other compatible devices, you need Roxio Toast Version 8 or higher.

Note it does not currently work with Snow Leopard, Roxio are working on a fix for Version 9 onwards (Not V8).

Peter.