For everyone who might be interested in computer forensics, data recovery (e.g. ext2/vfat undelete), file system internals, digital evidence, or just playing around with dd, The Sleuth Kit or similar tools:
Checkout Simson Garfinkel's Forensics Wiki which gathers information on the above topics and many more. The content is licensed under the Creative Commons Attribution-ShareAlike 2.5 license.
Contributors welcome!