PepperSocks
Bluelight Crew
Well I've never heard of anyone doing that besides those with Leary (or who was it, at least in his days) and yea I think you have to double your dose every so other period?
Richard Alpert (or Ram Dass) talked about it in his book "Be Here Now". They were trying to consume a steady regimen of LSD so that they would stay in the land of enlightenment and not come back down.

Anyways the just of the story was they locked themselves in a room for a few days and consumed ever increasing dosages (can't recall the numbers if there were any) and long story short, they weren't tripping very well at the end of it and despite their attempts, they still came down.