How to install
from DVD:
-pop in the disk and start "Mac OS X Installation" and follow the instructions as usual or
-pop in disk and reboot your Mac holding down "C" on the keyboard to dirctly boot from the DVD and install as usual
from USB thumb drive or iPod:
-open disk utility
-select your USB drive
-choose restore from the tabs on top
-drag the image over the "source" field or use the "Image" button next to it to navigate to your image
-as target drag and drop your usb drive into the "target" field
-check erase target volume (not necessary but just to be sure )
-hit restore and wait
-reboot your mac with your usb drive plugged in
-hold the option key on bootup and choose your USB drive as startup device
-install as usual
from external HDD:
-add a 8GB partition to your drive (only recommended if youre using GUID as aprtition sheme -otherwise you would have to delete the whole drive or use something like partition magic in windows)
-restore your image to that partition and go on the same way as with an usb thumb drive
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