How can I buy apps in the App Store without a credit card?

While I'm waiting for my credit card to arrive, I still want to be able to buy some apps for my iPad!

Are there alternative ways to pay for apps, without resorting to someone else's credit card?

I don't know if this is applicable to your country, but in Germany, Apple sells iTunes apps cards especially for buying apps in the app store.

The iTunes store accepts Paypal, so if you can get money to Paypal you're all set. I'm pretty sure Paypal has many ways to get money to them (mail them a check, give them your account number, etc.).

The trick seems to be that you have to sign up in iTunes on your Mac/PC -- the App Store on my iPod doesn't have Paypal as an option.