One of the semi-recent PS3 software updates allowed developers to group the trophies by main game/add-on, so if you go into the trophy list for Uncharted 2 and hit Triangle, then Square, it'll give you two seperate progress bars for your trophies, one for Main Game or Core Game and one for Add-on Content or DLC. The older games don't do it cause that was before the support was implemented and I guess they either can't or don't feel like updating it.
Edit: You can see it in Army of Two: The 40th Day as well, even though they don't have any DLC yet.
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