As I've mentioned, I've had 3.0 running for a while, but I haven't bothered with updating the carrier file to enable tethering. I've been patiently waiting until the 17th for the official 3.0 rollout to get that feature (luckilly Fido doesn't suck balls like AT&T). I was surprised, however, by iTunes notifying me of a carrier update available today!
I clicked 'download and update', and within 5 seconds under Settings > General > Network, I had the tethering options! I fired it up, and boom! I'm using my iPhone's 3G connection on my MacBook via USB while charging the phone. In fact, I'm posting this over that very connection.
With the OS 2.0 - 2.2.1 I was jailbroken, and tethring using PDANet. While it was a decent solution, it pales in comparison to the official iPhone tethering. With PDANet, the connection was made to the computer with an ad-hoc WiFi network, and with the phone using 3G and WiFi at the same time, it couldn't charge as fast as the battery was being drained. In addition to the power-sucking, it often was very difficult to get working, and seemed to require an unsecured network (not something I'm a fan of).
This official solution is pleasant, secure, battery-healthy, and does not require me to jailbreak. This pleases me, which is why I've written this.
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