Did you see the article about ATT switching unlimited users to tiered data if theyre caught tethering illegally? In the past, Ive tethered the crap out of my unlimited plan, but now that ATT is catching on and found a legit way to discourage it, Id be afraid Verizon will follow suit. Who knows though, maybe theyll give you a chance to cut it out before they switch you to tiered.
Another thing, you definitely dont want to tether unless you ARE on the unlimited plan. These apps and mods will allow you to tether for free but youve got to remember, IT WILL USE YOUR DATA! A lot of people dont understand that.