(via http://blogs.technet.com/office_sustained_engineering/archive/2008/10/22/announcing-service-pack-2-sp2-for-the-2007-microsoft-office-system.aspx)

"Performance and manageability improvements to variations in Enterprise Content Management (ECM) including STSADM commands for repairing links between source and target pages

Improvements to read-only content databases and index rebuild timer jobs in Windows SharePoint Services 3.0"