Signing up with Magpie is easy. You enter the details of your Twitter account and select the ratio of advert/tweets. Then sit back and let Magpie post the occasional ad until you've made enough money to receive a payment.
Magpie earnings can be used to either purchase your own ads, or you can receive a payment by PayPal when you reach €50 (currently $63 or £42).
Considering using Magpie doesn't require any extra effort on my part, I'm giving it a try for a couple of months. I'll let you know how well I get on. Have you had any experiences, good or bad, with Magpie?