No one has mentioned the Stems? Weird. They're definitely one of the best! You should also seek out: The Ooga Boogas, The Dirty Lovers, The Pink Fits, The Sailors, Shutdown 66, Onyas, Digger & the Pussycats, The Crusaders, The Booby Traps, Lords of Gravity, Cosmic Psychos, the Stoneage Hearts, Feedtime, and for '60s stuff, you can't beat the Missing Links (great collection on Half a Cow Records). I'd also recommend checking out the Eddy Current Suppression Ring. And pretty much anything on Dropkick or Off the Hip Records.
Los Hories from New Zealand are great, too.