(via www.securityfocus.com)
This article discusses the process of recovering deleted data from an ext3 partition, on a system running Linux, using a process called data carving. This basic technique is useful in any number of situations, such as recovering data that has been accidentally deleted by a user, information removed in an attempt to erase signs of a system intrusion that could be used to track the source, or data erased by an end-user attempting to cover up an acceptable use policy infraction...
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I can also tell you one thing that i come across a Linux Recovery tool called Stellar Phoenix Linux Data Recovery software which recover lost, corrupted, deleted or formatted Linux partitions/Volumes and recover deleted files & folders from ext2, ext3 and ReiserFS file systems.Give a try