A thought i would like to add is that if you do write your own and it is more secure then post it somewhere. I think the best thing that those of us who know how to write secure scripts can do is to lead by example

I don't think this would require a new section as we already have the Code Catacombs Section. Most of the scripts i have seen there are rather well written and when something slips through the cracks the commenters are quick to point out the error

Finnally you bring a really good piint that too any people learn the hard way. Never assume that code is secure unless soemone with a good amount of knowledge says so. this includes code you write.