I'd like to flash 'HTC desire' and found this:
I started to wonder if I'm able to do the flash.. because i use Debian and the tutorial is definitely for windows user.
I'm worried about these points:
EDIT: As Dan pointed out in the comments: Make sure you have HTC Sync on your system or get the drivers from the link he posted in the comments!
installed the windows hboot usb driver: http://unrevoked.com/rootwiki/doku.php/public/windows_hboot_driver_install