iOS has the MFMailComposer class, which allows the user to compose an email. What is the best way to open a new window in Mac Mail with pre-formatted email, as is done using the general buttons for Safari in Mountain Lion and Reeder?
MFMailComposer
Hmm, I think the recently introduced 10.8 NSSharingService should be my answer: http://developer.apple.com/library/Mac/#documentation/AppKit/Reference/NSSharingService_Class/Reference/Reference.html
NSSharingService