I love Alan Watts. I've spent many an evening listening to entire collections of his audio talks or attempting to watch everything available on YouTube; sometimes my girlfriend gets jealous.
He was the first British philosopher to bring eastern spiritual traditions to the west in the 60s. And is blessed, at least in my opinion, with an intoxicating speaking voice, cavernous depth of knowledge and fantastic sense of humour. I find listening to his work to be meditative; rarely does a listen not lead to some form of mindfulness practice.
If eastern spiritual traditions are up your ally I think you'll dig his work.