On the iPhone, there is a standard convention for editing lists. You have the list, above that there is the Edit button and the + button. You click on the Edit button and the list changes slightly notifying the user of change of status.
Does Windows Phone 7 have some type of a standard convention for editing lists? It seems every app implements their own.
There are UI design guidelines published and maintained by Microsoft for Windows Phone development:
http://go.microsoft.com/fwlink/?LinkId=220811
I’m not sure it will mention “standards” per se. However, the Phone’s built in applications (Hotmail, People, etc), all tend towards a common way and a podcast from Metro designers on Silverlight TV advised to behave similarly to the provided apps.
What I’ve tended to notice is: