No, they just moved to their own site. http://ux.joomla.org/
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Joomla! UX
Description
JUX is for a better user experience with Joomla! Discuss issues, improvements or just rant if you feel like it :)
Announcements
Don't forget to introduce yourself and let us know how you can help in the J!UX Rollcall!
Discussions
Wall
suggested by http://ma.tt/2010/10/experience-design/
another Joomsocial bug?
Read the ALERT at the top of the page in big bold letters
Strange how only that one discussion went MIA. I see the subject of an appropriate alternative is happening on twitter - http://twitter.com/#search?q=liammckay.