I've always thought voting would be the ideal candidate for AJAX
Actually, I disagree. Sometimes I find myself clicking the up- (or down-) vote buttons, but then (before reaching the "vote" button) change my mind and either completely reverse my vote, or remove my vote from a given node (+=0). If clicking a vote button auto-fired an AJAX request, I'd have no chance for take-backs.
Could it be a user training issue? Maybe. But I don't think I'll change my behavior.
s**lil*; $*=join'',sort split q**; s;.*;grr; &&s+(.(.)).+$2$1+; $; = qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)