"The authenticity of the letter -- which the military said American troops found Thursday in a raid in Baghdad -- could not be independently verified."

"The letter -- which never refers to al-Zarqawi by name -- is written to Sheik Abu Ahmad, a name not known to be used by the militant leader or his followers."

- CNN.com

I'm not much acquainted with CNN but i'm still taking this with a pinch of salt. As if the troops read EVERY single letter they find. Still, it's a little exciting.