Maybe we could use the same mechanism to protect LW wiki from spambots. The wiki registration page would be available only to people with karma at least... well, 1 should be enough. Reaching karma 1 should be trivial for any LW member, and pretty difficult for a generic spambot.
I support this enough to make a comment in addition to upvoting. Whenever I check the wiki's recent changes page, way too many of the recent changes are spambots creating accounts or Vladimir_Nesov killing them. As MixedNuts points out, the code end is difficult, but the fix would be highly appreciated.
I'd like to see, beside the cumulative karma as it is now, also its analytic. Does my 0 points somewhere means no upvotes and no downvotes or +7 and -7, for example?
A timeline graph would also be appreciated.