Why can't I turn off vibrate while keeping audio on when a e-mail comes in?
Mine too. I got this behavior to change by doing the following:


Open the Gmail app.
In the menu, select "Settings"
Select your Gmail account.
Select "Sound &amp; Vibrate"
Set the Sound to "Silent", and the Vibrate to "Never"


This fixed it for me. My guess is that it is a bug or poor design (the Sound option seems to override the Vibrate option).