Just when you thought Silicon Alley was running out of space for your events, training and conferences, the Think Tank at 100 William Street was unveiled for all the Alley-ers eyes to feast upon. And feast they did. Wrap-around counters offered snacks and monitors to feed your tummy and your eyes. Bright yellow walls, red chairs and other primary color features played with your eyes, too. A serious DJ system kept your ears busy, and if you wanted a slight repose to sit and surf, well there's a classroom with more flat-screened monitors, scanners and ergonomic setups. Bright, beautiful, bushy, peach-colored roses reached out of leafy baskets, and the goodie bag set you up with a tumbler, brainteaser, taste teaser (chocolate) and some trade magazines.