I am using the PDA Tethering app found in the market. IT's awesome. I am able to w/ the current version Tether and attain 2.4 mb dwn and 1.6mb up in Dallas, TX. I have done immense amounts of research on this and found some things interesting for those who havent' found this already.
I will note them below :
1st option : Tether using PDAnet App in market - Great USB tethering, supports Calls and SMS sending from the desktop and such. Works like a charm
2nd Option : USB tethering using the cable and Sprint : Just as good, however you need to add the tethering plan or option to your plan, if you do not, you will get Error Code 67 : unable to authenticate or validate your account for Sprint PCS Vision. Please Try again :
*as quoted from the Sprint Rep : Sir , in order to use that function we will have to activate the tethering via USB option to your account , which was some type of charge per month. I was like Sorry, no thanks."
3rd Option: Enable Sprint Hotspot for the phone where the phone acts like a 54g Wireless Router and assigns devices IP's from it's own DHCP. Good and works if you like that type of function. However this also requires the 29.99 per charge activation to use as a wifi hotspot from sprint, or else you get the same error 67 code as mentioned above. .
In conclusion, i would if you are looking for free, look at the PDAnet software app. It's free and works awesome.
Just my .02 cents.
Thansk.
Osirus.