According to official German websites, the Jewish population in Germany has tripled in the past decade, especially thanks to a large wave of immigration from past Soviet countries, but is still only one fifth of what it used to be before the Second World War. The Jewish community (at least the registered one) in Berlin is the largest in Germany, more than 12,000 people.
The main Jewish organization in Germany is the Central Council of Jews (a bit of an unfortunate name, I think…). Judaism is of course an official religion, which means it has the same legal status as the Catholics and the Lutherans.
The Jewish community in Berlin has a very nice website (although some of it is still “under construction”), in which they give information about the synagogues, rabbis, Kosher restaurants and delis, educational centers, social support for members, and Jewish events. One of these events is the Jewish Cultural Festival, which took place last September. You can also find a lot of relevant information in HaGalil website.
We, btw, tried one Kosher restaurant, called “Beth Cafe”. I don’t want to be mean, but I really, but really, do not recommend it. Maybe it was a bad day, but the Cholent Soup I ordered was very horrible, and wasn’t even remotely similar to anything I know as Cholent. And it was a big disappointment, since a good Cholent is really something to die for. So, to compensate, here is something about this dish, including recipe. It is especially appropriate on rainy weekends.