Tipps and hints before departure
The official currency in Egypt is the Egyptian pound (LE). You can change on location (e.g. at the airport). USD and maybe DM are the most useful foreign currencies. You may have problems with credit or debit cards since few institutions accept them. Nevertheless, you may succeed with Visa or EC/MC (you cant use Visa Electron and other electronic cards).
If you have any chance to have an ISIC card, take the chance. It will do you credit! Most places you can visit for half price.