I've switched The Wheel over to the newly available Google+ commenting system. There are some advantages, but there are disadvantages as well. For one, the "Recent Comments" widget is broken. For another, the comment count at the bottom of blog posts is broken. For a third, you have to have a Google+ account to comment (but if you have a Google account, adding Google+ is easy). I'm sticking with the new system, in expectation that Google will eventually get these shortcomings worked out. But in the meantime, beware.
Update: I've switched back. See the comments for why.