This free script allows you to easily navigate in timeline. You can change the active time segment by dragging the slider, or zooming with your mouse wheel.

Bug report: [email protected]

Version info:
1.6.1 (2013. Apr 7.) Error in new scene fixed, callback event error fixed, zoom to selected keyframes works with biped objects.
1.6 (2013. Mar 19.) Available to Zoom to selected keyframes.

Version: 1.0.6
If you have several animations in 1 file and want a quick way to switch between them, this script might be useful for you.
TimeLine Control lets you create a list of named time ranges. Also add, remove, rename and sort items in this list. List is stored in INI and automatically loaded on next opening of your max file.
Docks above max timeline for quick and easy access.

a Maxscript Controller to measure and expose the distance traveled by an object.
1: select an object, a point or something else
2: run the script
3: in the modify panel, clic on Pick Reference button and pick the object you want to mesure travel distance.

Now, if you animate the object in autokey, you will see the value changing.
You can use it in wire Parameter or in expressions or script controllers

This is a 3dsMax previsualization tool. It allows you to jump cameras and time to previs scenes.

Its the only tool I know that allows you to skip anywhere in time to create 'cuts' in 3dsmax like a video editing package

Installation instructions are here.