I was reading another thread and someone wrote (2 years ago so it might have changed) that nether portals worked on .org! Is this true?

 

No, I'm more than certain they don't work. That would defeat the whole purpose of skyblock.
If you want a nether themed skyblock, connect to: hellblock.net

 

This problem existed for Skyblock.net before, but was fixed. It would be cool to go to Hellblock.net through a nether portal (with items not going between servers and things like that).