He was a true visionary who was unafraid to look deeply into reality, human nature (in all its weirdness), & the infinite mystery before us.
Most people would find his ideas to be waaaay 'out there', but I see him as a true Crazy Wisdom master.
One of the few things I really thought he was off the mark was his "TimeWave Zero" theory. He postulated that on Dec. 21, 2012, the end of the Mayan Long Count cycle, there would be some kind of manifestation or emergence of a Singularity. In this scenario, "Time," as we know it, would collapse. Consciousness would expand into a higher dimension or state of being.
Based on calculations using his fractal timewave theory, McKenna called this history-ending event: "The Transcendental Object at the End of Time". There may still be some kind of event that alters global consciousness at some point, but he was obviously mistaken to pin it on a specific date.
Over the past year. I've been watching the progress of a video series, documenting McKenna's ideas & lectures. The final episode was recently uploaded to coincide with the end of 2012, so here is the link to the series & the first video embedded: