If you have a rather recent HTC phone, the manufacturer allows you to unlock its bootloader the official way; the procedure might involve a lot of steps and, in the end, you are achieving root on your device with the price of officially voiding your warranty.
Not that any severe tampering will not void your warranty, but why let the manufacturer know about it, right? The HTC Super Tool from XDA Developers promises to root a variety of HTC-phones, including the EVO 4G, 3D, Shift, Inspire, Sensation, Incredible, Amaze and more. If you’re techy and interested in having total control over your phone by cracking it open, check out the source link for more details, including the fact that there’s currently no functioning S-OFF, but is planned for future releases. As usual, bold and italic word of warning is due when tampering with your phone!
Source: XDA Developers