Technet now hosts a technical reference for the available STSADM commands based on Silverlight. Beside a view that shows all the commands you can choose a view that only displays commands new in SP1 or SP2 or commands that offer operations which are not available in the UI.

You can also change the view between operations view properties view.

Check it out at

• http://technet.microsoft.com/en-us/office/sharepointserver/cc948709.aspx
• http://technet.microsoft.com/en-us/windowsserver/sharepoint/dd418924.aspx