This geek tip is pretty simple but a total party-saver at times. If you have a series two and above TiVo, and your TiVo is hooked up to your network, you can access your iTunes (or any other mp3) library from your TiVo menu.
First, download TiVo Desktop for free. Then just go to your TiVo homescreen and select "Music & Photos." Scroll down this list, and you will find your computer by whatever name you've given it (i.e., mine comes up as simply "G5"). Choose this and you'll be directed to your music library (note: only mp3 files are accessible). Then select the songs you want to hear and play! If you've already created a playlist on your computer, you can have a party mix ready to go, straight from your TV!