Back in the day (in the old days), CFLib had commenting. I removed it when I did the last major update. James Moberg contacted me recently and suggested making use of Disqus, a hosted commenting system. I had heard great things about it and thought that CFLib would be an excellent place to test it out. This morning I did "the work", which ended up being approximately 10 minutes or so of clicking around. I spent more time FTPing then integrating code which really shows you how good of a job they've done on setup.
You can see a few sample comments already on the sigJsonToImage UDF. I'll probably delete those when I get around to it.
So far I'm very impressed. If that changes and I'll post back a comment here. I'd love to know if any of my readers have used Disqus and what their experiences were like.