Anyone who has custom alarms in vCenter will be frustrated when they need to set up the same alarms in multiple datacenters as there is nothing out of the box that provides this either in vSphere 4 or 5 (please let me know if there is!).
To this end I have written a utility that allows simple export and import of alarms in and out using the C# web services API. It works really well and also effectively allows state management of alarms so that if anyone fiddles with alarms can easily reset to known set.
Update 21st May 2012 – nearly ready to upload… been doing some more coding on the front end over the weekend. Works with vSphere4.. just looking at vSphere5 compatibility.