Clear, the folks behind the national 4G WiMax rollout, introduced a (rebranded) mobile hotspot today that solely targets the iPhone, iPod, and iPad crowd. "iSpot" is similar in functionality to the MiFi -- wirelessly sharing an Internet connection. However, instead of Sprint or Verizon providing connectivity via 3G towers, it's Clear's WiMax network.
Clear iSpot for $100 and connect all of your (up to 8 ) iOS devices to it for $25/month (deal!). However a simple hack allows you to take it a bit further and connect those bandwidth-heavy Macs, PCs, Androids and Linux to your $25/month iSpot. The hack releases MAC address restrictions.
If, for whatever reason, you were after Verizon's USB 4G Wireless service on your Macs, you're officially out of luck. However, a hack developed within the gardens of Howard Forums allows one of the two USB Modems (Pantech) to work on the Mac.
More Info: Clear iSpot