This is a fascinating tidbit for the Apple history fans out there. Michael Steil has the story of how the original Apple I BASIC was recovered from an audio cassette which had been digitized into a MP3. Apple I BASIC was the first piece of commercial software sold for the first Apple computer. Only about 200 Apple I's were produced and not even all of them came with the BASIC cassette.
Apparently this is the first time a "confirmed perfect dump of the 4096 bytes" of Apple 1 BASIC has been produced. So now you can see the original 6502 assembly that is the "spiritual" ancestor, as it were, of all of Apple's software.
[via Mac OS X Internals: The Blog]