I finally installed the file too. It's working great, but I'm still nervous that this method may be easier for AT&T to track than something like PDANet.
I am not sure that they (AT&T) can track it. I think as long as you don't go crazy and use it as your main method of getting on the internet with your computer, you will be fine. Just keep an eye on your usage and don't go over the 5G "limit" of your "Unlimited" data.
As others have said, just don't go downloading tons of movies or spending all day watching YouTube.
I personally don't plan to use this all that much. Don't get me wrong. It is GREAT to have,
but I use my iPhone as a Netbook already when I am on the road traveling. I do not take my laptop much anymore on quick trips. This will come in handy for those times I
have to have a full laptop and I am in the middle of nowhere and I can't find a WiFi hotspot. Which has happened a couple of times.
Now I am don't have to worry about it!