For $5, I registered Synergy, a program that interfaces with iTunes. It puts up MTV-like introductions to songs and lets me assign hotkeys to various actions.
As I’m low on screen space anyways (even running space), I appreciate not having to switch contexts to find iTunes and hide it again. You see, I use the 5-star rating system built into iTunes for my smart playlist:
“Old, But Not Horrible:” order by least recently played, use only songs with zero stars or with at least three stars
Anytime I hear a bad song, I can now hit cmd+option+shift+1 to assign it one star. (That’s my key choice, not theirs.) It stops playing and I go on to the next songs. Along the ways I’m putting more good songs into the most rewarding playlist, “Top Rated.”