Just got back from Germany where we used two Fonic SIM cards on the 1.95 euro a day flat rate deal, mainly for data.
A great deal.
I was chatting to the the tech guys in Hamburg Saturn (an electrical store) and they said Fonic was hands down the best for the occasional visitor to Germany, mainly because of the great daily rate, the fact that it throttles back to around 64Kbps when you have used your 500MB allowance and the fact that the card stays alive for longer than a year.
+Steve

[size=2]Steve Gold
PO Box 1014, Sheffield S10 5YG, UK
Home mobie: Telefonica O2
Other UK mobiles: 3, Vodafone, Virgin
Foreign SIMs: Toggle (multi); Germany (Fonic); Poland (Orange PL);
Skype: stevewgold