I think the best way to use a .GS would be to register names that are related to that particular region. Think of things that are special to just that region. This way, if someone googles for such a special thing that is found only in that region, - even if the results would bring up many sites in the front page - if yours is also there - seeing the .GS extension, they might think to pay a visit to your site. That's what I think. Again, if you can register domains like computer.gs, internet.gs etc that might buy you something great after an year or so ..
