In the most recent update of Snow Leopard that came out last week (10.6.4), that I didn't cover, it seems Apple has updated the XProtect.plist file to include a new trojan named "HellRTS".
I guess this answers my original question, if they are going to keep it updated, am I am glad they are, however, I'd like to see them update it even more often than that, and of course include more things. It's better than nothing, I suppose.. but I'd like to see more.
As of right now, there are a whole three trojans protected against in the XProtect file.
You can find this file in the:
This article by Sophos turned me onto the update, but I reposted without the conspiracy theories: