Viewport Grabber
This script lets you grab the currently active Viewport and save the images. You can set a timer to grab sequences - or turn on AutoGrab - which will grab the viewport every time you change something.
Additional Info:
View a screenshot of the ViewportGrabber interface
Install:
Copy pb_ViewportGrabber.mcr to your uimacroscripts directory - restart Max and you will find it under CustomizeUserinterface - Category 'Piranha-Bytes'
Version Requirement:
5