Nagios 3.1.0 has just been released as a development/testing snapshot of the Nagios 3.x code. It fixes a number of reported bugs that are present in 3.0.6 and includes a new feature that will check for new releases of Nagios. Once the 3.1.x release branch is tested enough to be considered stable, a stable 3.2.0 release will be made. Read the Changelog, download Nagios 3.1.0 and give it a try.