Yes as of today, the ArcGIS 9.2 beta is closed. All the beta forums are now read only (actually not all, but most) and beta users are supposed to use normal ESRI support methods. ESRI has created a new website, ArcGIS 9.2 Prerelease (login with your existing ESRI account), where you can still download software updates and get information about the prerelease and release candidates. And the best news? ArcGIS 9.2 will begin shipping November 2006 to customers (though I’ve gotten reports that ESRI sales reps are saying December 2006).
Keep an eye out for that 9.2 Beta survey and fill it out. Tell ESRI you’d like to see MORE blogs and MORE wiki’s in the future and that they were helpful. Personally I liked the beta site so much more than the previous beta sites ESRI has done. I hope this new portal is the future as both the beta site and the new ESRI Customer Care portal are such a big improvement over the older sites.