cloaking, hard questin, many issues, etc.. from my side and experience the best thing to do is to register your domain in .de etc... than redirect all the traffic from your .com domain to that de domain. Don't get me wrong with cloaking you can get pretty productive traffic and many sales, but that's also blackhat, so be careful with doing such things. Cloaking pages, one for google, one for bots and one for real humans works best! but psss don't tell anyone
