​It's hard to keep up to date on everything, and SharePoint is no exceptiopn. Unfortunately, Microsoft hasn't exactly made finding updates for SharePoint easy. Fortunately, we've already done the legwork and came up with this handy site from Microsoft's TechNet: 

http://technet.microsoft.com/en-us/office/ee748587.aspx

This page keeps track of the following MS produts and their respective updates:

• Microsoft Office suites
• Microsoft Office desktop programs (including Access, Excel, InfoPath, OneNote, Outlook, PowerPoint, Project, Publisher, SharePoint Designer, SharePoint Workspace, Visio, and Word)
• Microsoft Office servers (including SharePoint Server, Forms Server, Groove Server, PerformancePoint Server, Project Portfolio Server, and Project Server)
• Office Web Apps
• Search Server
• SharePoint Foundation and Windows SharePoint Services
• FAST Search Server for SharePoint

Enjoy the fruits of our labor! :)