One of my absolute favorite scripts for 3ds Max and probably the one that's used the most day-to-day is Martin Breidt's "Incremental Save". It eliminates a ton of headache when dealing with lots of revisions to Max files over a long period.

Using ProExr with Photoshop to bring in Multi-Layer EXR straight from your renderer helps reduce time & keep files to a minimum. It's my favorite way to get renderings into Photoshop.