As mentioned in the blog, sourceforge, regrets that they had to take this step, but urge you to write to your congressman/senator about this.
This is affecting some of our members. For example Gag the graphical bootloader is hosted on
http://gag.sourceforge.net/
We have two forum members from Iran,
Vigol and
mfaridi. So these will not be able to download GAG anymore, while Gag's developer is Spanish IIRC.