Now you can easily root Android 2.2 (Froyo) on HTC Desire HD and T-Mobile G2 with VISIONary. Just download and install VISIONary app from Android Market and it will root your device within 1 minute.
Note: This is a temporary root for Desire HD & T-Mobile G2 which will last until next reboot of your device. Before launching VISIONary app, you must enable USB debugging mode by navigating to Settings->Applications->Development->USB debugging.
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Though it is a temporary root for Desire HD which will allow you to run apps that require root access but still you won't be able to edit system, hboot and recovery image after rooting your device with VISIONary. However you will be able to backup and restore your device through Titanium Backup. [Thanks to Apache14 at XDA Developers]