Have you met the new CoolGrindz Coffee Lounge? Opened in March - next door to the DoubleTree Inn on Park - it's the big sister of a perking little coffeehouse-turned-success story in the Publix shopping center at Lake Ella. The lounge is showcased in lighted, tiered cabinets filled with daily baked cakes, pies, flan, crostatas, brownies, quiches, cookies and pastries. The role of these goodies is, of course, to complement the host of gourmet coffees, espressos, teas and other drinks. But they also double as desserts for the bistro soup, salad and sandwich selections served from lunchtime till 10 p.m. Quite apparent, among the downtown diners, are student types, their open textbooks and laptops spread over the tabletops. Wireless Internet connections expand CoolGrindz's role from coffeehouse and bistro to cyber cafe. And that's not all. Within the next year, look for a dance bar, Japanese water garden, humidor room and private, climate-controlled wine lockers to be added in the yawning spaces upstairs.