Today, I was just reading through my weekly Heart of Business e-newsletter and they mentioned Tad Hargrave's Radical Business site (he provides marketing consulting to holistic businesses). I had come across it some time last year and had shared some of his marketing self-assessment materials with a client. I remember now that it really resonated with her, so it may do the same for you too (just scroll down for the sign-up box in the right-hand column).
Radical Business has an interesting youtube channel full of excerpts from his business intensive that many of you may find useful. From it, here's a nice, simple, straightfoward explanation for understanding your niche:
Tad Hargrave, Radical Business, Niche: Demographics vs. Psychographics
