Actually, that's not right: In Star Wars
, the ability to preserve one's consciousness after death is a technique that one must learn and perfect, and very few knew of it at the time of the movies. I can find no evidence that Galen knew of this technique, so I would assume that he faded into oblivion as any other soul that doesn't possess this secret knowledge. In fact, the novelization of the first game supports this for it describes Galen's soul rising from his body and then dissolving into nothingness.
Good post, Smith_Stalker. I hope you don't turn out to be one of those people that signs up for Lucas Forums only to make a single post and then goes away forever.