As of Aug 28th, 2011 many more Xbox 360 consoles are now vulnerable to the Reset Glitch Hack developed by GliGli and Tiros , Tiros is a familiar name GliGli is a new hacker to join the ranks of the 1337 amongst Xbox hackers.
Here is a link to the thread on the site that released the hack publicly http://libxenon.org/index.php?topic=145.0
All Xbox 360 Slim Trinity motherboard are vulnerable to the hack, unless you run into a rare one with the wrong type of NandFlash…which has not happened to me yet.
When RGH 2.0 is released PHAT 360s will again be vulnerable to the hack, if you have a system with dashboard version 14699 or below it will still be vulnerable to the hack also. Xenon motherboards can be hacked once to get the DVD key and return it to a retail state, but the glitch is unreliable so there will be no hacked dashboard for them.
The image below will help you identify your motherboard type by looking at the power adapter on the PHAT and the back panel near the serial number on the Slim , the power rating is what you look for on the Slim , a Corona is 12v and 9.86a and a Trinity is 12v and 10.83a.
Credits for the image go to DarkFib3r Thanks Bud