25.01.2010 a biggest opensource projects hoster, sourceforge.net denied access to certain countries, which are Cuba, Iran, North Korea, Sudan, and Syria(correct me if I missed some). They wrote it on their blog
SF referred to US law, since this was made to follow it. But the way I see it is quite different.
What they actually did is made problems to legal users from these countries. And the ones that should (probably) be blocked will bypass it just by using proxy.