Can I send Notification Center items to my iPhone using Pushover or Prowl?
Solution 1:
An extensive search has determined the following:
There are a number of ways to SEND notifications TO Notification Center in Mountain Lion.
There are currently no hook in AppleScript to read notifications FROM Notification Center. This would be a key starting point in piping such notifications to Pushover or Prowl.
Conclusion: As of OS X 10.8.2 - no. Sorry. :(
Good luck and happy notifying!