All you've got on me is a year and that uterus thingy. Other than that, nada.

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I don't see why "-XX days to 100%) is confusing people. If a positive number is the days left until you hit 100% then it's logical that the negative number is the number of days since you hit 100%.

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If I remember rightly, activity is done daily, yes? Why not update the stats page at the same time (a daily job, like Chruser suggested)? It would be a sensible time to do it, and seeing as it's activity based it would be a sensible group of processes to carry out. You can even bundle the two together and release a new activity hack.