Something that popped into my head with this suggestion: normally a node's reputation is not visible until after you vote on it (except in Best Nodes or Worst Nodes, etc.). If this is desired behavior, it could be easily circumvented by spending a vote to see a node's reputation, then unvoting.
I like the idea of being able to correct a mistaken vote, but I don't know whether being able to correct a mistake is more important to the gods than the hidden nature of a node's reputation (and I have no idea how difficult this would be to implement, either). ++Theo for an interesting idea.
-- Mike
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just,my${.02}