Also try those at link to follow. I'd try Recuva first.
Bob
-> http://forums.cnet.com/7723-7588_102-354911/lost-and-found-or-the-storage-forum-sticky/?tag=contentBody;threadListing
Camera Micro SD card was formatted by mistake. It was specially used to take photos of some important meetings. And the newly taken photos also would be saved on the inner Micro SD card before uploading to computer. But, yesterday, for some unexpected reasons, I formatted this card and made all pictures lost. I need you help me get them back. Have any idea for me? Thanks in advance!

Chowhound
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GameSpot
Giant Bomb
TechRepublic