SplitFunds.sol

contract SplitFunds {
    
    function split(address[] addrs){
        if(!addrs[uint(block.blockhash(block.number-1)) % addrs.length].send(msg.value)) throw; 
    }
    
    
}

This is awesome, thanks for publishing. I'm referencing it in my post here: http://vessenes.com/do-not-mess-with-eth-classic-it-will-f-you-up/. I think the odds of two slots getting the same funds are worse than you say, though -- I believe it's a 'birthday problem' -- when will n randomly chosen numbers be the same, given m possibilities? That makes the odds bad enough that I'd suggest the contract be instrumented to allow a re-send. I suppose you could just call it multiple times in this case.

As a side note, choosing the addresses may bear some thinking -- I recommended people use vanilla (not sequentially generated from the same private key) addresses for each 'slot'.

I'm planning on using this technique in a dapp that'll reference my fork oracle for the condition check.

EDIT: Ah, I see there's already a splitter that uses Timon Rapp's oracle. No biggie.