After a long pause, the Lotus security page has been updated. The IBM website lists 5 issues with Lotus Domino and Lotus Notes, all of them minor issues but still a reason to think about upgrading to the current release Domino 6.5.4 which is available for download. Check this site regulary and check if the reported issues are relevant for your environment: http://www-128.ibm.com/developerworks/lotus/security/