WiBro Egg, a wifi-tethering device using WiBro (which is like 4G WiMax pretty much), has been launched in South Korea. Think of it as the MiFi device, except it’s about 10 times faster.
According to the test reports, it’s doing about 8Mbps down and 4Mbps up, not too shabby.
I know Sprint already has a “giant” 4G hotspot device, hopefully they will be adding smaller ones like this later this year.
Here’s a demo video of the device (in Korean):