The OpenOffice Wiki places the release on September 17 and there are not yet any references from the main OpenOffice.org website to this new version, but can be found on OpenOffice.org mirrors driven (such as OSUOSL). Just head on over to a mirror and through the Mozilla Bouncer interface choose OpenOffice.org-2.3.0 along with your platform and locale. OpenOffice.org 2.3 is available for Linux, Solaris, Mac OS X, and Windows.
The next OpenOffice.org release, version 2.3.1, should be out on December 4, 2007. Look for the official OpenOffice.org 2.3.0 release announcement on Monday. If you missed it, IBM announced this week that they would be joining the OpenOffice.org community (press release).