Tethering iPhone

On the upcoming Verizon network, yes. No for ATT.
MBPro 3.06 GHz, 8 GB Mac OS X (10.6.5) 2xMini; iPad 64 3G, iTouch; many ExtHDs, 3xdrobo@6TB, Apple TV 1gen with ATV

Yes. It wasnt until this year that AT&T decided to make tethering available to iPhone customers, however it is not cheap & if you are on the unlimited data plan(no longer offered) & grandfathered, you will have to give that up if you add tethering to your account. You will lose unlimited data forever(unless AT&T decides to add it back, unlikely). Did I mention that it is expensive?
MacBook Pro

pvonk wrote:
On the upcoming Verizon network, yes. No for ATT.You can indeed tether with AT&T.
powerbook g4, iMac 20 Mac OS X (10.6.4) Time Capsule, iphone 3gs, iphone 4, ipod, ipod touch

Thanks for that bit of news - I hadnt heard.
MBPro 3.06 GHz, 8 GB Mac OS X (10.6.5) 2xMini; iPad 64 3G, iTouch; many ExtHDs, 3xdrobo@6TB, Apple TV 1gen with ATV

You obviously have no idea what youre talking about, as your post is completely inaccurate.
MacBook Pro