This is great and I would use this. I even think about porting/forking/stealing this for a German audience.

The only thing that would keep such a site from growing is the relative reservation of less technical crowds (at least that has been my observation). HN, proggit, SO: they are all useful and fun for the technical minded. Similar sites for other segments (excluding cats, cats always win) are much less active and sometimes fail to attract some critical mass.