Since Yudkowsky's 30-day Karma is currently 6055, and he hasn't posted that much over the last month, the answer must be "all votes on all posts within the past 30 days, regardless of the age of the post or comment".
This doesn't look that useful, I think it should only count votes on recent posts/comments. Also, this measure, if amended this way, looks informative enough to allow an option of viewing a longer list of active contributors, which could be linked to from caption of the sidebar section, like with "recent posts".
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= f037147d6e6c911a85753b9abdedda8d)
(By the way, if I'm not mistaken, my Karma dropped exactly 100 points the moment this change rolled out. Possibly a symptom of some counting bug in the new (or old) version?)
Strange. The calculation for total Karma has not been touched by these recent changes.