Betty ClarkeThe Guardian, Tuesday 17 October 2006 00.13 BST It is 20 years since John Rzeznik and Robby Takac founded the Sex Maggots in Buffalo, New York. Two days later, they became the Goo Goo Dolls. It was a fortuitous decision: the college rock band have since turned into pop perennials whose songs don't squirm but swoon. Celebrating not just their anniversary but the success of their 10th album, Let Love In, with three sold-out nights at the Empire, the Goo Goo Dolls' evergreen blue-collar romances are adored by teens, who sing, squeal and frantically wave banners at Rzeznik.He plucks on