creating a totally offline "savings" wallet using linuxcoin...

i want to make sure this a valid method to create an offline savings wallet using linuxcoin

1) boot from linuxcoin iso cd on offline machine
2) run bitcoin client, note address
3) copy wallet.dat from /home/user/.bitcoin to usb media
4) shut down (at this point wallet.dat should be gone from RAM and now does not exist anywhere but my usb media)
5) whenever i wish to put coins in "savings" i send coins to address from 2)
6) if i wish to "withdraw" from savings in the future I copy the wallet.dat from my usb media to a computer running bitcoin, and once it has downloaded the block chain i can spend the coins.

i want to make sure i dont fuck anything up and lose my coins trying to secure them. so let me know if i have overlooked any steps or if anything i'm planning here is wrong...