Improved Chase Camera
Download from SpaceDock
Source on Github
This plugin gives you the option to make the camera follow your surface velocity vector.
This gives you a better feeling on how your plane is moving, its angle of attack, sideslip, etc.
Press Tab to toggle.
(You can change the key in settings.cfg).
Toggling it off and on will bring it back to the default view angle.
Set autoSnap to true in the config to have it always snap back