Just out of curiosity, how does a hard drive loaded with MP3's stashed in the glove box compare to having an actual iPod connected to the same HU.
I'm currently using a 60GB 5th gen Video iPod with my AVIC-D3 (and don't plan on anything changing any time soon), and I love it. I have over 4,000 songs on it, so searching by artist or song (from the HU) can be a bit tedious, but with a few well set up play lists I don't really have to worry about searching for anything any more.
Other than being a few bucks cheaper, is there any advantage to the hard drive vs. iPod?