There's a reason I like my Bose system better than any other I've had: I can tell it which songs I don't like, and my shuffle feature eventually plays only the stuff I want to hear. It sounds a lot like the Pandora process, but with the music you've collected. And I'm guessing your mp3 catalog is starting to become as populous and diverse as your CD collection from a decade ago. So why can't your iPod learn your behavior?
With Instinctiv, now it can. After installing this application, your iPhone/iPod Touch playlists will eventually tailor itself according to your preferences. First, you'll need a jail-broken iPhone or iPod Touch. Then you'll be able to download the application and install it on your device. Activate the Instintiv shuffle feature and it will tailor your iTunes playlists based on your behavior. There's no voting involved (it is, after all, your own music). Simply skip the songs you don't want to hear and be on your merry way.
Or, you could just get rid of the songs you don't like anymore--they're taking up valuable space on your iPod anyway, right?