Todd Klindt has already covered the new stsadm commands that were added in Service Pack 2 (SP2) of SharePoint here (Top 6 new STSADM operations in SharePoint 2007 SP2), but it looks like we slipped in a few more in the April Cumulative Update:
Lets a site collection be marked as deleted, which immediately prevents any further access to its content.
Added in the April Cumulative Update to perform gradual deletion of site collections. When an operation uses gradual deletion, a site collection is immediately marked as deleted, which prevents any further access to its content. The data in the deleted site collection is then deleted gradually over time by this timer job instead of all at once, which reduces its effect on Windows SharePoint Services 3.0 and SQL Server performance. Gradual deletion is available in the Deletesite: Stsadm operation (Office SharePoint Server)and Mergecontentdbs: Stsadm operation (Office SharePoint Server)operations.
Sets the current values of the Enterprise search settings in Microsoft Office SharePoint Server 2007.
For additional information about how to manage settings to improve search results, see Helping users make successful queries (Office SharePoint Server).
Displays the current values of the Enterprise search settings in Microsoft Office SharePoint Server 2007.
The two following articles were updated to include use of the gradualdelete parameter:
Back up and restore site collections by using built-in tools (Office SharePoint Server 2007)
Delete a site collection (Office SharePoint Server)