The official Froyo update to the Sprint HTC EVO 4G has now officially been rooted! There are step by step instructions at XDA Developers, though this isn’t as easy as the Android 2.1 root method. You will need to get down into the EVO’s firmware if you want to get superuser access. If you are willing to risk bricking, or making your phone useless,  you may want to check of the directions at the link below (NOTE: Android Phone Geek takes no responsibility for this). I expect a much more streamlined method to become available shortly. [XDA Developers]

Related posts:

1. Simple Root: Root Your HTC EVO 4G The Easy Way
2. Froyo On The Sprint HTC EVO 4G
3. How To Root Your HTC EVO 4G
4. HTC EVO 4G Root Gets You Unlimited WiFi Hotspots
5. HTC Sprint EVO 4G Fully Rooted