Current version is based on jquery framework. Would be nice to see Mootools based version too.
We have been awaiting this release and as for my opinion, JComments is the best comment extension for Joomla due to its flexible settings, suitable UI and usability. Moreover, its code is very clean and maximally optimized - very awesome plus.
Just been installed and tested new version - JComments goes onwards and from the other hand it's absolutely free (GNU/GPL).
JComments can be easily integrated to other components (there is a huge list of supported extensions) and your website can use one comment system. Also it's possible to import comments from other components to JComments.
JComments can work both on Joomla 1.0/1.5, so I would advice anybody to take a look at this extension, since it will enhance your social related website immensely! This is must have!