Do people that don't have unlimited data plans have to pay extra for tethering? If so that's kinda bullshit. To me if you have X gigs of data to pull through that phone per month it shouldn't matter how it gets done whether its from the handset or from a PC pulling through it.
Even at that rate who would want to tether, on 3G at least, unless they absolutely had no other choice? 3G seems like dialup at times.