Foraging maps have certainly become a lot more popular in the last year. Here's another Google Maps mashup showing where you can pick free fruit and vegetables in Germany.
From the map sidebar you can select different categories of map marker to view on the map, these are Berries, Herbs, Nuts and Fruit. Under each category there are a subcategories of map marker showing you the location of the different types of free growing food. For example, the 'Fruit' tab includes markers for apples, pears, oranges, cherries and plums.
Of course these foraging maps only really work with effective crowd-sourcing. So, if you know of any German fruit sources that aren't already on map you can fill in a short form and your find will appear on the map.