The latest service pack for ArcGIS 10.0 has been released and is now available for download. This release includes many fixes for targeted issues and enhancements.
The detailed list of issues SP4 can be found here :
http://downloads2.esri.com/support/downloads/other_/10.0_SP4_Announcement.pdf
ArcGIS 10 Service Pack 4 download locations can be found here:
ArcGIS 10 (Desktop, Server, Engine) Service Pack 4