I have just added an additional tab to game pages that shows any DLC packs they may have, and the tab itself shows the number of DLC packs in brackets.
If there is a single DLC pack for a game, you'll be taken immediately to that pack. If there are multiple packs, you'll see them all listed.
When viewing a single pack, you'll now see your friends' scores in that pack, as well as the achievement distribution graph for it.
If you own the pack, you'll also see a summary of your score in the pack, when you started it, and a pretty completion indicator too
You can also now add DLC packs to your wishlist!
Have a great weekend