Me too, listening to music invokes this for me. I see music. Not like musical notation on a staff. I see each component of a song progressing through space, melody as a line moving up and down, bass as the ground, percussion as punctuated puffs of air or smoke. The climax of a song is like a bird bursting up through layers of cloud into a clear sky. It's like my brain is permanently on a Winamp visualization. (Edit: dear ghod, someone else in this thread used that exact same metaphor. Freaky.)

That's about the only area of synesthesia for me, though. I don't have any crossover between taste and smell and other senses like the folks described in this article.