DealStartsHere: The HTC G2 Finally Get's a Permanent Root!

Here's a guide on how to Root your HTC G2 or Hero:

Step 1: Restart into the BootLoader Menu. You can do this by powering on the Phone while holding the Back Button.

Step 2: Extract the leatest version of GSM Hero Recovery Image into your android SDK/tools folder. You can find the files HERE.

Step 3: Download the Superuser.zip and extract it to your SDK/tools folder. You can download the Superuser zip file HERE.

Step 4: Plug the USB Cable in and open a Command Prompt. You can open one from the tools directory and type the following command: fastboot boot recovery-RA-her-v1.5.2.img
(you'll be entering the recovery console on the phone)

Once you've opened the recovery console do a Nandroid Backup. When completed continue to step 5.

Step 5: Now type the commands below in CMD as they appear. Push enter to create a new line.
            adb shell mount /system
            adb push su /system/bin/
            adb shell chmod 4755 /system/bin/su
            adb push Superuser.apk /system/app/
            adb shell reboot

You have now successfully rooted your G2 or Hero!

Now head to the market and download Root Boot (this app will only work if you have root access!)

As always I accept no liability for your actions!

Credit goes to XDA-Developers.com