I don't want to be a fuddy-duddy, but satoshi never posted on the forum we use today and is called Bitcointalk.org.
The original forum was hosted on sourceforge.net. That's where satoshi posted. After a while it migrated to forum.bitcoin.org, which was also created by satoshi, I believe.
Satoshi was last active in 2010. On August 01, 2011, theymos announced that the forum is moving from forum.bitcoin.org to bitcointalk.org. This migration happened after satoshi already disappeared.
At the request of Sirius, who owns bitcoin.org and the server this forum is hosted on, I have moved forum.bitcoin.org to bitcointalk.org. This is the final result of a long email discussion among many developers, exchange operators, etc. I have always been opposed to the move, but Sirius wanted to act according to consensus.
The forum was the only thing on bitcoin.org except for a few static pages, so I don't feel like we've lost too much by separating from it.