Well, this is a weird experience. After trying to rank for a site for 2 weeks with backlinking (quality high pr links and some articles) I only saw my site drop and drop in serps. I decided to put some new content so I added an article. Magicly my site went from 50 to 20 in one day and is on top 5 on many non US google engines. BTW I used social bookmarking, blog comments and articles, no luck.