Are there any additional level packs available for LittleBigPlanet? There seems to be an endless array of costume packs. I've downloaded the Metal Gear Solid and Pirates of the Caribbean levels, but that's only because I knew about them and was looking. I can't seem to find anywhere that lists any additional packs that include levels.
LBP considers stickers also new level pieces, so I'm not sure if you want to count those or not. I've listed the ones that come with new level assets such as objects/sounds instead of just stickers. Packs that only have new costumes and stickers are not included on this list. If you want stickers included, I'll edit that in later.
This list includes packs that came with new level pieces, and are still as of this posting available (doesn't include stuff like Beta Tester only things or limited time offers).
As of September 2010, the packs which include new content for level creation that are available for download are:
You can find the full list of DLC on Wikipedia.
I believe you are referring to packs containing complete levels that were created by Media Molecule themselves, in which case I believe the two you mentioned are the only ones there are.