What is the value of a one dollar bill in Germany?

If you're referring to the current exchange rate, those change almost every day so any conversion factor posted here will be out of date very quickly. While it's not normal WikiAnswers policy to say "use the internet", that's the best option in this case. For the latest rates you can check sites such as www.xe.com or CNNMoney.

If you're asking whether a US $1 bill can be used for payment in Germany, the answer is no. Germany adopted the euro in 2002 along with most of the rest of the EU so stores will expect payment in euros.