Just installed a jaunty little thumb thing, which you'll now find at the end of every single comment.
The software has the ability to do both up and down votes. I decided not to enable down votes, at least not yet, because we're already a fairly cantankerous group as a whole, and I didn't feel like adding still more negativity to the site. I do need to see if I can move the thumb to the top right corner of a comment, if only because that's how the old system worked, and, you know, tradition.
Let me know what you think. And should I enable this on the posts themselves, in addition to the comments?