Maybe for the code gallery, but otherwise I think post editing is stupid. I seem to be the only one.
I mean, this forum lets you preview your post and everything, and if you're going to post a little while after your first post, I don't see why posting again has such a bad stigma.
Also...
NPC Code:
Poster 1: Hey guys, who likes cupcakes?
Poster 2: Love 'em!
Poster 3: I like huge ones
Poster 4: I always put frosting on mine
*Poster 1 changes first post to "Hey guys, who likes butts?"*