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There's been exactly one block with non-standard transactions:
http://blockexplorer.com/b/71036
... and it contained no fees.
HOWEVER: jgarzik, you're over-reacting, too. This will not cause a block chain split; all clients will accept blocks containing non-standard transactions as valid. Most (many?) just won't put non-standard transactions in blocks that they generate, and won't relay them. There will be no havoc.