Sun have released Java 6 Update 18, also known as version 1.6.0.18
The above link is for the Sun Developer Network, the download for most end users will be the one called Java SE Runtime Environment (JRE) – JRE 6 Update 18. The new version is not listed on the java.com site yet, this is normal for Sun who tend to wait a while before updating that site with the latest release.
This feature release does not contain any new fixes for security vulnerabilities to its previous release, Java SE 6 Update 17. Users who have Java SE 6 Update 17 have the latest security fixes and do not need to upgrade to this release to be current on security fixes. For details of the fixes see Java SE 6 Update 18 Release Notes