Coworker and I just got finished making our USB Vista/7/XP (home and pro) install flash drive. Works flawless so far. Does require a 16GB flash drive however (comes to about 10GB). Structure \boot\ (normal bcd stuff) \Sources\Boot.wim (modified Windows 7 PE) \SEVEN (Contents of a Windows 7 x86/x64 DVD) \VISTA (Contents of a Windows Vista x86/x64 DVD) \XPHOME (Contents of a XP HOME CD) \XPPRO (Contents of a XP PRO CD Setup.exe (Custom shell/installer. Our modified Windows 7 PE will use this file as a shell) I'll have a guide up later when I'm further awake. All OS's are installed via the Windows PE environment.