The tutorials are way out of date and don't apply to anyone that has bought an Evo in the last month or 2. The new phones have a different Hboot and some have different cameras that require 3.30.651.5 or there phones get screwed up. Unrevoked only works for phones with 3.29.651.5 or older and you will probably brick your phone if you use the old method of reverting back to 1.47. There are alot of Noobs joining our ranks and some of them will blindly follow the old methods and screw up their phones. For those that have the Hboot 2.02 try this method it will work:
[ROOT][GUIDE] HBoot 2.02 S-OFF - Like a Boss Edition! - Updated 11/20/10 - xda-developers