This link it often cited in converstations about this topic, but I think maybe it needs to be updated to really stay useful. I think the page footer says it all.
Generated from Id: poop-comparison.pod,v 1.35 2003/09/30 15:47:47 autarch Exp.
I have found the latest updated
POD in the sourceforge CVS repository (only 8 hours old), however, it seems these revisions have not made it onto the
main page.
There also does seem to be some spotted activity on the poop-group list. I haven't waded through it myself, but you might find some interesting stuff there.