We don't know when, or why, it happened, but knitting is suddenly hot, with knitting groups popping up like crop circles. La Ti Da, at home in a converted Old South Pearl Street cottage, came along at just the right moment. Knitting mavens Kim Allegretti and Rita Marshall knew exactly what they were doing when they opened the combination coffeehouse, yarn store and gift shop. La Ti Da not only caters to south Denver's needle-wielding denizens by offering them a comfy place to gather, buy top-drawer yarns, learn new stitches or simply while away an afternoon; it also provides an outlet for local artisans, whose wares -- teensy sweaters and poodle dresses for babies, stunning scarves, jewelry, pillows and more -- line one homey alcove. Just the thing for a tight-knit community.