"He learned that when she played the song, a rootkit hidden inside the song installed itself on her computer" - Is it only me or this sounds a bit bull, how on earth a rootkit installs from an MP3?

Learn to read, guys. The file was most likely wrapped inside a "packer" as the article states (maybe a self extracting .rar file with the malware hidden in the executable).

I have to agree with Brian Carrier's comments. I don't think it is the end of computer forensics at all. I came across

http://www.anti-forensics.com

too which has a lot of methods and yeah, it's going to make an examination hard but I don't think it's the end of computer forensics.

Anonymous
Lets you and myself do a little experiment. Lets download limewire or your choice of a peer to peer network. Now then we'll download 100 songs from there into a folder called see I told you so. I myself will run a virus scan on the folder b4 any music is played and you just start playing the songs. Okay now after deleting all the copyrighted music I'll post what I find on here in a fews days and you can post after you get through reformatting your computer getting rid of the mess that just playng a song got you into.