We've recently released Moodle 2.0.3 and Moodle 1.9.12.
In addition to a number of bug fixes and small improvements, five security vulnerabilities (4 major, 1 minor) in 2.0.2 and two security vulnerabilities (both major) in 1.9.11 have been discovered and fixed. Thanks to the reporters and to all the team responsible for fixing these security issues.
As always, we recommend that you upgrade your sites to these latest versions as soon as possible. All 50,000 admins of registered Moodle sites have been notified previously.
Upgrading from 2.0.x or 1.9.x should be very straightforward. Full details about the releases can be found in the Moodle 2.0.3 release notes and the Moodle 1.9.12 release notes.
The releases themselves are available from the Moodle download page or CVS/Git.
We're now working hard on Moodle 2.1, with a release date planned for 30th June 2011.