VSS - For changing mass amounts of materials, with the least fuss, or tinking with large amounts of materials over and over. My default load has a few VSS props with favorite settings so I can set up a scene quickly and get right to tweeking. My only issue with this script is I can't figure out how to get Synchronize and Designer buttons to be on my main Python Scripts tool bar.

Scene Fixer - I use it because it does many things, and it only takes up one space on my Python Scripts tool bar. It's also set up really nicely.

And most important script...

**Render Settings - ** it's included in poser and it's a must.

I could list another dozen scripts I think are fantastic, but I don't use them everytime.