Here is another nice little detailed guide thread, I thought it was pretty well done and hope it helps to unlock via HTC and flash roms and recoveries, for HBoot 1.50, thanks to MPGrimm2, these are his personal notes and recently updated. Hope it helps some of you, let us know then we can add it to the guide section if you feel it is worthy. 
[Guide]My Hboot 1.50 HTC Unlock/recovery/rom/kernel flashing notes 3-22-12
[Guide]My Hboot 1.50 HTC Unlock/recovery/rom/kernel flashing notes 3-22-12