The Circle Pad expansion peripheral announced for the Nintendo 3DS alongside Monster Hunter 3G last week is already seeing support from third-party developers.
In addition to Monster Hunter 3G, other games that will support the second analog pad include: Resident Evil: Revelations, Metal Gear Solid: Snake Eater 3D, Ace Combat 3D, Dynasty Warriors Vs. and Kingdom Hearts: Dream Drop Distance.
That list isn’t conclusive. Other games will support the device as well. Also, note that at this point, it still sounds like the the Circle Pad add-on isn’t required for playing these games. The device will cost 1,500 yen ($20) in Japan and will also have a slot for a AAA battery as well, which will be required for it to work.