With the exception, perhaps, of the traditional trade show flu, nothings thicker in the air CES than overlapping WiFi signals. Phones, PCs, SmartTVs, game consoles, tablets and routers are all desperately reaching out to something to connect to, and D-Link is happy to oblige. This year, the company is debuting the DIR-510L, a $100 portable router that doubles as a device charger.