I'm curious as to what you find valuable about it. I have to admit everything I have seen seemed more than a little shallow. Your spiritual life doesn't strike me as being very shallow and I know the est/Landmark people don't have a lot of time for religion per se - though they like to quote from MLK and Gandhi without really acknowledging their spirituality.

I have a close friend who went through est/Landmark/Tony Robbins/NLP/etc., and I have some co-workers that praise landmark to the skies, but everything they tell me seems shallow and sort of cheesy in that "American salesperson" Amway kind of way.

Any light you could shed on it would be appreciated.