Last Hippie Standing is a documentary on Goa, "the hippie paradise of the 60s", with interesting footage from that period, including their wild parties and the Anjuna flea market. It tracks down and interviews some who never went back. It also looks at the more recent crop of ravers, hipsters, and vacation hippies who now visit Goa (45 mins; see video in larger format; via Leanne Ogasawara).
I also spotted a book by Arun Saldanha, Goa Trance and the Viscosity of Race, whose description looks promising. That said, his related article, White Ravers in a Goan Village, starts out well but then descends into jargon and obscure invocations of theory—the kind of stuff that gives contemporary academic writing on culture a bad name among general readers.
Also check out Lost in Goa, a story about a few Israelis in Goa, including how they think and relate to India. Israelies visit in large numbers after their mandatory military duty. "India is a decompression chamber that keeps these young Israelis from imploding and revivifies them so that they can rebuild themselves and function in the civilian world." The story is in three parts: one, two, three (via Louise Gordon).