Microsoft Office 2010 Service Pack 2 is out. It is available via Windows Update as well as downloadable.
Service Pack 2 (SP2) for Microsoft Office 2010…contains new updates which improve security, performance, and stability. Additionally, the SP is a roll-up of all previously released updates.
Service Pack 2 for Microsoft Office 2010 (KB2687455) 32-Bit Edition
Service Pack 2 for Microsoft Office 2010 (KB2687455) 64-Bit Edition
Updates are also available for the Visio and PowerPoint viewers via Windows Update.