Subject says it all.
Remy Card has made some patches to add ACLs to linux-2.1.54. These can be
found in ftp://tsx-11.mit.edu/pub/Linux/ALPHA/ext2fs/. I have a (slightly)
more recent patch for 2.1.57 I can send you if you like (although its fairly
easy to get Remy's earlier ones patched).
As usual, if this frightens your cat, destroys your disks, or gives you
nightmares, I really don't want to know.
-Chris