Clearwire has gone live in another market, Las Vegas, this week, and together with new devices and new roaming services from partners Sprint and Comcast, there is a real momentum behind the WiMAX operator’s build-out, and a sense it is crossing the line from interesting experiment to disruptive commercial reality. The operator had already soft launched its Las Vegas service last month but officially went live yesterday. It promised the ‘superfast mobile internet experience’ of a home connection ‘anywhere around town or on the go’. Clearwire is becoming more aggressive about its speed promises too, having complained recently that, while it focused its literature on average performance, competitors with slower 3G networks marketed peak speeds. The Las Vegas statements promise…