I came across this website today that could be an awesome tool for anyone in the U.S. that wants to do more. Earth911 allows you to enter your zip code and it will give you listings for all your recycling needs - from car batteries to cardboard. So if you're like me and have a stash of used batteries somewhere - add dumping them responsibly to your spring cleaning to do's and let this website help you!
I'm curious to see how it'll be in Germany. I would LOVE it if they had some sort of community compost.