Many good submissions probably get missed because they don't generate an initial interest and most of us that don't have a lot of time won't be on the lookout trying to filter new posts but checking the stuff that has already been up voted a lot.
pg linked to it on Twitter yesterday which likely drew a lot of attention. twitter.com/paulg
He probably even read it here and then twitted it.
yeah probably. His tweet came about an hour after this submission :)
This happens quite often. Several good links escape attention due to low votes and get lost. Shouldn't I have got a "link already exists" message?