We are pleased to announce that ArcGIS 10.0 Service Pack 1 was released today. We recommend that you install SP1 for all ArcGIS products at your earliest convenience. There are many fixes and improvements that are included as part of this service pack.
Links to the downloads and installation instructions are below:
If you have any questions or run into issues with the installation please contact Esri Technical Support at 1-888-377-4575, option 2, or visit the Support site. Users outside the United States should contact their local distributor for help.
Mike H., Program Manager
User Advocacy Group, Esri Support Services