Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_0_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5B108 Safari/525.20)
Same functionality, SOCKS proxy. 3proxy runs in the background so you can use your phone while tethering. NetShare needs to be open for you to be able to tether.
In my location 3proxy is nearly twice as fast as Netshare in the same location. I use them both because one has certain problems in Firefox, one has problems getting Hotmail or Mobileme mail, etc. So they both have good and bad points.
I even have a Sprint Expresscard but in my location 3Proxy is again about twice as fast, so I will be getting rid of the card as soon as I can get 3Proxy to work in Bootcamp Windows XP on my MBP, if that's possible.