Enhancing Crossfade
iTunes should crossfade songs when (1) using the skip back/forward buttons and (2) double-clicking a new song in the library. Basically, the plug-in should always have iTunes crossfade between songs, not just at junction of the end and beginning of a two songs. There is never a hard break between songs. If the plug-in also had BPM matching, you could even be my hero.
I have requested this feature with every release of iTunes and while it would be easily implemented, it has still yet to appear.