VMware has today released a Update 2 for vSphere 4.1. vSphere 4.1 Update 2 includes number of security fixes, number of NIC drivers updates and fix for failing VAAI storage vMotion operations on EMC VMAX array running a specific firmware level.
Release notes for VMware vCenter Server 4.1 Update 2 are available here, and for VMware ESXi 4.1 Update 2 here. Update 2 download link is here.
Also, VMware vCenter Site Recovery Manager(SRM) 4.1.2 has been released.
See release notes here:
http://www.vmware.com/support/srm/srm_releasenotes_4_1_2.html