It seems that if you look at the column on the right of the page, you can see upvotes and downvotes separately for recent posts. The same [n, m] format is displayed for recent comments, but it doesn't seem to actually sync with the score displaying on the comment. This feature only seems available on the sidebar: looking at the actual comment or post doesn't give you this information.
Thanks, whoever did this!
Woot.
A thought: Now one might be able to find the most-controversial LW posts, (measured as max(up+down-abs(up-down), perhaps) in the same manner that Top gives us the most-popular. It might be interesting to see empirically what topics LW treats as controversial.
Remark: a+b-|a-b| = 2 min(a,b) so your proposal interprets "most controversial" as "largest absolute number of minority votes". (Not a bad interpretation.)