Back in the mid-1990s, when webcasts were in their infancy, shortwave radio enthusiasts quickly pointed out that webcasts weren't portable -- one was tethered to their Internet connection via a desktop or laptop PC. Fast forward a dozen years...the predominance of Wifi technologies has launched untethered laptops and spawned a generation of Internet radios. Shortwave enthusiasts could still claim that shortwave radios provided unmatched portability.
Enter cellular broadband technologies...you can now install a USB card into a laptop computer and obtain relatively high-speed Internet access anywhere you can get cellphone access. AT&T has featured the former newsman Bill Curtis in a series of commercials touting where he's "found the Internet" using his AT&T laptop card. Verizon has a technology that allows you to create a personal Wifi "hotspot" which, in theory, could provide Internet connectivity to a battery-powered Internet radio.
If you live in India and have Reliance Mobile phone service, you can now access the BBC World Service via your cellphone 24/7 using the "R-World" service. Who needs a stinkin' radio, anyway?