Sprint this morning gave its WiMAX-based 4G service a boost by introducing two new routers to bridge the mobile Internet connection to a local network. The Cradlepoint MBR1000 takes any of Sprint's 3G or 4G ExpressCard and USB modems, including all-in-one modems, and shares the connection over 802.11g or n Wi-Fi to as many as 32 different devices. Unlike most cellular routers, it has three large
