I know the sceptical amongst you may refrain from risking it, but i have done some searching and found nothing untoward for this.
It asks you to download free apps (hence the apple id confirmation request) which have 'in app purchases' through this they make money (lots). You dont need to use these apps, just open them for 30 seconds, job done. It then confirms in the browser and adds credits which you use for other 'good' apps.
I now have infinity blade 2 (£6) for free and it was legitimate. I already have bought some of the best ones though.
Here is the link.
http://m.freemyapps.com/share/url/d8e63780Fair enough if you dont want to, but you will just be missing out
