ESRI has released an update to the Spatial Analyst Supplemental Toolbox, bringing the version to 1.3. It adds new tools for zonal statistics and tabulate areas functions, and new options for watershed analysis (he determination of maximum upstream elevation).
An overview and details are available at the ArcGIS Resources blog. A direct download link to the toolbox is http://esriurl.com/SpatialAnalystSupplementalTools and a complete discussion of the tools in the toolbox is at Introducing the Spatial Analyst Supplemental tools
Please note that ArcGIS 10.1 SP1 or later is recommended.