I mentioned that over at HT last night. I'd say most of them once people started commenting about how well written they were Seriously, though, I'd say between October and December (the last one I did, I think was in early December). Homero, Chris, Jessica (yes, she participated), Dan sometimes, rarely Joe and Eric.
He is generally illiterate, but reasonably competent with his knowledge of crypto. Certainly enough to use install and use a wallet. If someone told him what to do, he'd be able to perform any functions required so I wouldn't put it beyond him to be able to cut and paste a key in a text file (Prime Controller). Any development was far beyond his intelligence or capabilities - so forking would be out of the question (as would compiling).