There are some interesting ones that I've never heard of before now. For example, there's an At The Drive-In one, a Five Iron Frenzy one, and some others I didn't expect, like Jethro Tull and Cake. http://www.wootang.net/backmask/mp3.html Ch-Check it out.
Hmm, I was wonder about the Five Iron Frenzy one. Here's the spoiler thing they put, but I'll put that actual truth behind it. Fact One: Five Iron has never had a dummer named Brad. In fact, Brad was one of their horn players. Fact Two: The only major line-up change was when Scott Kerr, one of their guitarists, left the band on personal issues, and ironically, almost caused the band to break-up. He was replaced by Sonnie Johnston. Fact Three: Reese Roper, former lead singer, was the one who said that Brad had met an untimely death. He then wrote a song called The Untimely Death of Brad, which was also referred to in That's How the Story Ends, off of Five Iron's final studio album, The End is Near. Fact Four: Five Iron's drummer is Andrew Verdecchio.
They (meaning who runs the site) don't know who half the bands on that site are. They just get sent the songs from fans of backmasking, and post it on the site. They didn't know who Incubus was.
I did some looking into Backmasking not long ago. There's some flash things on a site somewhere that have Stairway To Heaven and some others. Just look up stairway to heaven backmasking on google, you might find it.
The best ones are in the pop category. One I cant post here, but the other is my favorite: "Sleep with me I'm not too young." - 'Baby One More Time' by Britney Spears It's so blatant it almost seems on purpose.
some of them are ridiculous. e.g Metallica - SKOM It kind of sounds like Believe us or something but these should be taken with a grain of salt.