[via Bob Fox]
New additions in MOSS 2007 SP2
preupgradecheck - Bob shows how he ran this new stsadm switch on his test lab. It is available in SP2 to preview readiness in upgrading to SharePoint Server 2010. He provides helpful insight on what this information provides.
Backup, Set your databases to Read Only - "If you run this command on a working environment there will always be a chance for the job to fail if users are adding content to the sites. To prevent this we now have a new feature that allows us to lock the DB and make it read only."
GetSiteLock / SetSiteLock - Example, "A company has multiple organizations that it owns and for some reason one of those companies goes under. The information that was listed on that companies site is still something that other employees want to consume but we don't want any more data being posted to this or have any changes made. Couple fixes come to mind to solve this. We can change the sites security permissions giving everyone read access. This, depending on the complexity of the sites security, can take a great deal of time. We could also archive the data someplace else (perhaps on another portal thats being used for Archive or DR purposes)….both take time and are not alot of fun. OR we can run a simple command and in one sweep render the site in 3 different states using the new command line tool setsitelock."