Some good points (above) made on user freedom and abusability (is that a word?). Personally I don't have any problem with how the system works now. But I know that if I were to double post, I would cringe and desperately wish for a delete button.

Perhaps all posts could go into 'holding' or 'upcoming new nodes' or some such place. They could sit there for 60 seconds, during which they cannot be voted on and may be deleted by the original poster (and saints?).

Again, personally, I preview most of my messages at least 5 times before posting them. Especially if they have code in them.
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Graq