Well, when I participated the Ludum Dare 18, I saw that even after the competition time the users could edit their entries, updating its games with improved versions. In my opinion this is a cheat, because the competition is focused on making a game in 48 hours, but not what it seems when you can edit the entry and replace the previous game for an improved.
For me it takes away the characteristic of the competition and becomes a thing of unfair means, and may even affect the results of the competition.

This post aims to expose my opinion on one thing I think unfair and should not happen. I’m not against the called “Post-Mortem”, on the contrary, it stimulates the desire to continue making games and improve them. But I think just the first version posted should be judged, and that should not have the option to edit the entry. But can be happen bugs in a game that may make the game unplayable on some computer, for example, in this case I think that the edit of a entry is valid.  So the competition will be fairer and better quality, since users need to work harder to get a better game.

Thanks, I hope you understand my opinion!
PS: Sorry if my english is bad.