This is pretty interesting to me. When karma was implemented at /. we used to expose the number, but then the number became why people did things on /. Then we obscured the number by replacing it with english words like "excellent" for the top karma scores, then we started paying off in terms of allow people to moderate and meta-moderate. It was pretty neat at the time, but I have to admit I like HNs system. It seems like it embraces the karma rather than obscuring it as some kind of necessary but lamentable side effect, which is how it sometimes felt at /.