When you go to the bank and get your CD-R and set the wallet up again, all your bitcoins that you sent to that wallet will magically appear.
you have to use -rescan for the magic to work, though, afaik.Bitcoin 0.3.21 puts a 'bestblock' entry in the wallet so it will automatically -rescan if you restore an old wallet (and it only rescans the blocks necessary to get up-to-date).