Filed under: WirelessPart of the WiMAX World festivities taking place this week, Motorola was on hand in Chicago last night to demonstrate fragments of the Mobile WiMAX build-out it's been throwing together to support the upcoming launch of Sprint's Xohm service. A leisurely cruise took curious onlookers down the Chicago River while Moto demonstrated a variety of WiMAX-friendly goodies like VoIP and streaming video, with handoffs flawlessly (apparently) transitioning the signal from access point to access point amongst canyons of skyscrapers, steel, and cement. The company also took its demo onto the