ArcGIS 10 Service Pack 5 has been released and is now available for download.
This release includes a large number of fixes and enhancements and I would encourage those using ArcGIS 10 to apply this service pack.
A number of compatibility issues between ArcGIS 10 and ArcGIS 10.1 have also been addressed.
US/Rest Of The World
The New Zealand download links are intended for users in New Zealand. This mirror contains a subset (most popular) of files.