somewhere in my cramped schedule i plan on taking some time to really evaluate some of the power behind the Yahoo UI Library. Ive seen Dustin Diaz do some cool stuff with it, but this morning Ryan pointed me to a sick WordPress comment installation by Jack Slocum that was rapidly built using YUI. The system allows you to comment in blocks of content within a blog post, as well as the overall post. VERY cool. And, as Ryan pointed out, really freaking fast.
Demo/source included in the posting of the project itself.
worth checking out for sure.