13th Floor Elevators, The Seeds, The Church, Opal, Julian Cope, Hawkwind, Black Sabbath, Flower Travellin' Band, Kyuss, Gong, Electric Wizard, Yawning Man, Speed Glue and Shinki, Red Krayola, Grateful Dead, The Brian Jonestown Massacre, The Warlocks, The Congos, Roots Radics, Les Rallizes Denudes, The Beach Boys, Neil Young, Slayer, Acetone, Burzum, Celtic Frost, Mobb Deep, Johnny Thunders and the Heartbreakers, Spacemen 3 et cetera
Have to say I couldn't help but notice a couple of R.E.M. tracks, esp one from New Adventures in Hifi called "Departure", borrow heavily from that riff! :)