Pre paid/Pay as you go iPhone 4 sim in Germany

[Ryox]

I am going to Germany for business reasons for about 3 months and I will be taking my unlocked iPhone 4 with me as my only phone/email on the go.
There for to avoid extreme data charges while abroad I'm considering getting a german pre paid/PAYG sim card with me mainly for data usage and the occasional phone calls.
As I don't know Germany at all I'll be using google maps and other Internet apps to get around. Mainly on the weekends when I'll have time to travel and sight see.
I would appreciate any suggestions for good value phone tariffs in Germany that have a fair amount of data

 

[miles01110]

They're all about the same. SIM cards are everywhere. Go into any electronics store and pick the one you want.