Any keypad shortcut to toggle between "normal" and "silent" modes? On all Nokias, holding down the # key does this. Looking for one button to hold down.

By default there is not a way to do specifically what you're wanting, although with the 'Q' key you can toggle between your current profile and vibrate.

To add the functionality you are asking about try a third party app such as BBSmart - BBSmart Shortcuts which can be used to create shortcuts for profiles.