My pal Girish has a whole host of tips for Windows Phone interaction.The vast majority come down to the one thing I tell everyone when they say “How do I do X?” The answer is
Press and Hold
Try it! Try it everywhere! Then build it into your apps as well.
This is because the content is the UI. Want to act on something? Interact with it directly.
(Oh, and don’t forget to check out Girish’s explicit list of a bunch of things in case you don’t feel like just experimenting)