Psychedelic researcher Roland Griffiths of Johns Hopkins on a few podcasts talking about psilocybin and meditation.
Buddhist Geeks 377: Meditating on Mushrooms
Although the formal research is ongoing, in this podcast Roland hints that at least so far, there appear to be significant benefits for experienced meditators that occasionally (and carefully and prudently) experiment with psilocybin. Your mileage may vary, but in my experience, duh! Very exciting to finally hear a little bit about this slowly progressing study.
They are still looking for appropriate candidates that are experienced meditators that have either no experience with psychedelics or experience that preceded regular meditation practice.
Buddhist Geeks 378: Psilocybin: A Crash Course in Mindfulness
Continuing the interview with Roland Griffiths.
Some talk about the Good Friday Experiment, Griffiths' validation of that, etc.