you can create with Transmac, macdrive or with UltraISO or MagicISO the install DVD from a *.dmg with Windows, there are certainly other options that I have not mentioned how to create a bootable DVD.
for USB stick they can do with Transmac or with macdrive.
use Google Search!!
I now installed the .pkg file from Nawcom MODUSB on my USB and I also installed the .dmg on the other USB successfully. Now when I boot I have boot priority: First Boot Device: USB-HDD and Second Boot Device: USB-HDD and Third Boot Device: Hard Disk
BIOS Settings as in spakk's first post. Still can't find SATA3 Ctrl Mode [AHCI]
in the Intregrated Peripherals menu in the BIOS though. I don't have ON Board 1394 Function either (I think this is 990FXA-U
Other BIOS settings I made:
AMD C1E Support [Disabled]
AMD K8 Cool&Quiet control [Auto]
Hard Disk Boot Priority:
1: USB-HDD0 SanDisk U3 Cruzer Micro (Nawcom ModUSB
2: Ch2 S.: Samsung HD642JJ (I want to install OS X on this disk)
3: CH2 M. : OCZ-PETROL (my SSD where Windows is installed on)
4: Ch0 S. : Samsung HD502IJ (just a hard disk for movies and music etc.)
When I hold F12 in the boot menu and select USB-HDD it goes to a black Screen with "Loading Operating System ..."First Boot Device is my Nawcom ModUSB
Snow Leopard USB drive (other one) isn't connected yet.