New build: Best way to flash BIOS before installing OS?

I%26#39;m going to be putting together a new machine in a couple weeks. I%26#39;m going to be getting an Asus P5B-E with an E6600, SATA HDD, SATA DVD-RW, 2GB DDR800, and probably a 7900GS (still considering an 8800GTS).   I%26#39;ll be installing XP on the clean WD Caviar 160GB SATA drive.  I%26#39;d like to update the BIOS before starting the XP install, thats a good idea, right?  Should I get a floppy drive and connect it using the IDE drive just for doing the BIOS flash? Is it possible to use a USB drive or Asus tool that doesn%26#39;t need an OS?I can post the exact specs if necessary. I%26#39;ve been molding the perfect wish list on newegg.  New build: Best way to flash BIOS before installing OS?
You can use a USB key if your mobo supports booting from USB keys. You need to make your USB key bootable though, which is somewhat involved.New build: Best way to flash BIOS before installing OS?
Ok, so it sounds like getting the update onto a floppy disc would be easiest.  Does it pretty much involve getting the file onto a floppy disc and making the floppy drive 1st in the boot order and it executes appropriately?
I can think of three solutions:Many newer motherboards have a bios flasher integrated. That is, when you start the computer, there is a prompt that tell you something like ''press F2'' to go to flash utility. So you only need to provide the bios image file. Sometimes theses utilities support usb flash drives or cd-rom drives, else a floppy disk will work. Look at you motherboard manual to know if you can do this. Other than that, you can burn a DOS boot cd. When you have booted the cd, just execute the flash utility thatyou put on another part of the cd, another cd or even a floppy disk together with the bios image. You can also use a DOS boot floppy if your computer still has one. 
Cool, thanks for the help.