Well, I've had a few people come to me after I released HellMarch with some suggestions. I ignore all of them.
I decided to make a zombie ambient. The noises are derived from the game "Half-Life 2" and some Counter strike.
It is a pretty good loop that doesn't show to much evidence of the actual loop. Unfortunatly, though, the sound quality had to be lowered to fit under the 500k cap.
http://www.mediafire.com/?4qkodxt1xd1^^Clicky^^
Enjoy!!
Remember that these make an EPIC zombie DM. sets a perfect mood and the random footsteps and sounds almost make it feel liek your being stalked.