That is really great Jakob, I love how those look. For a previous job I had to create lots of similar maps (I loved doing it but it is very time consuming).
I was never able to find anything that could convert from pdf to kml though I think it does exist. I haven't looked into it for about four years though.
Hopefully buried in my archive I still have all the English, Welsh and Czech cultural sites mapped out in a similar format to Jakob's Berlin housing estates map. It may take me some time to find them though.
You may also be interested in Protected Planet
(I think Solivagant may have flagged it to me years ago, though I'm not sure). You used to be able to download all the shape files on it, but it became difficult to do so last time I tried.
Will try to come back with some more info when I have a little more time.