For ISVs building and distributing commercial Force.com applications, the Summer '10 release includes a great new feature, Push Patch Updates. Prior to Summer '10, in order to apply a patch, it required a new Managed-Released package to be manually installed by the subscribing org. Now, with Summer '10, Push Patch Updates enables all ISVs to seamlessly push out patches and bug fixes to their customers.
This feature enhances, but changes, the Force.com release management process so it is important to review the online help documentation before utilizing this functionality. It is important to understand when to use a push patch update to fix a bug and when to release an updated managed-released package.
For more detailed information on this new Summer '10 feature, please see the additional links below.
The below are links to the salesforce.com online help and require authentication.