One that I had installed on all the artist's machines is Clickie
Clickie adds 2 context menu items to Windows Explorer - Copy Path Name and Open MS-DOS Prompt.
The Copy Path Name does what it says, copies the path of the selected file to the clipboard so you can paste it into any import prompt.
I also recommend ConTEXT for MEL Scripting.
Thanks for sharing so many tools. I can't wait to get back to the office and try out some of these new tools!