A buddy of mine recently downloaded a movie (Scarface) off of Kazaa.
I introduced him yesterday to TDS-3 Trojan Scanner.
Today he was scanning his harddrive and TDS-3 recogized the movie as having a NTFS ADS hidden data stream.
I didn't have a clue what it was, other than it didn't sound good.
I went and researched a little and found the TDS-3 homepage to be more than helpful.
Read this site it's quite interesting.
So check it out you NTFS and Kazaa people.
To get the best trojan scanner, IMO, go here and get TDS-3: