We all know about hidden songs at the end of CDs, whether it be an extra track or just a bunch of silence followed by a secret song. But how many CDs have a hidden track at the beginning, meaning you "rewind" track #1 and find it? I only know of two:

X-Files - Songs In The Key Of X
Lit - My Own Worst Enemy

Are there any more out there?

The original presssings of Goldfly by Guster had a hidden track at the beginning. Later pressings have the song at the end of the disc.

Versus - "Two Cents Plus Tax"

I think the Less Than Jake album "Losing Streak" has a track 0, if my memory of my college roommate's CD collection serves me correctly.

Less Than Jake!

They Might Be Giants - Factory Showroom

Original pressings of Better Than Ezra's "Friction Baby" had what sounded like a Spanish-language version of Secret Agent Man as a hidden Track #0. I believe it was taken off later pressings.

AFI - Very Proud Of Ya

your assumption of less than jake is correct

I don't remember what the album is called, but I remember Willie Nelson having a hidden track at the beginning of one of his CDs.

Freddy Jones Band - North Avenue Wake-Up Call

Monopuff - Its fun to steal