Current proposal @ http://code.google.com/p/lesswrong/issues/detail?id=144 calls for switching to a zero-based system with no self-upvotes or downvotes, and showing ratios of upvotes to downvotes (so making comments in old threads, that won't be much upvoted or downvoted, won't count against your "average" quality).

I'm beginning to think we may also want to go ahead and switch to that brilliant suggestion for distinguishing the quality upvote/downvote, and the agreement upvote/downvote.

However, all this requires programming work and isn't the top priority right now. An experienced Python programmer willing to volunteer a noticeable block of time would probably get around to it a lot sooner.