I updated my Evo to the Froyo 2.2 on the 29th and lost my wireless tether/unrevoked3 so I stayed up most of the night messing with it trying to get any tether without the $30 fee.
After a few hours I finally got the USB Tether to work. I first went to
Mobile Apps and Games for Blackberry, Windows Mobile, Android, Symbian, and Palm | Handango and purchase an app called Tether Plus for $6.99 one-time fee, dragged it onto my SD card via usb disk drive and install. Make sure to have Unknown Sources checked in your application settings so that this app will install. Follow the direction it gives you because you have to go to a link on your computer the download driver and .exe file. Unfortunately this will only work for computer that are 32-bit and lower. I have Windows 7, 64-bit.
Sooooo, I searched and searched and found a computer driver for an app called Easy Tether (didn't buy this one because it cost just a hair more $9.99, there's a free version but I found that it didn't load a lot of websites) which has both the 32-bit and 64-bit and downloaded the 64-bit...taa daa...it works. Here's the link
Download EasyTether drivers
All you do after all of this is...open up the Launch tetherplus.exe on your computer...connect your Evo via USB and check Charge Only....right click on your tetherplus icon in your taskbar which actually says TP...and click connect via android (HT077HL03713). The #s in the parenthesis maybe different per each phone...not sure.
Anyways...there you have it. I am online now using my Tether Plus App through my USB charge only on my EVO and it's hella fast!! BTW...my USB tether is working with 3G...I don't have 4G in my area.