The OpsMgr R2 Cumulative Update 2 has released – available at http://support.microsoft.com/kb/979257

Kevin has a walkthrough of installing it posted at http://blogs.technet.com/kevinholman/archive/2010/04/30/opsmgr-2007-r2-cu2-rollup-hotfix-ships-and-my-experience-installing-it.aspx