cannot live without (from VS): - syntax highlighting obviously - THIS IS BIG: open IDE with unlimited number of instances. I forgot which IDE annoyed me on this one... IntelliJ? - reference lookup - intellisense - code (unit test) coverage map, unit test project integration - ability to make my own extension, add-on, macros, etc - SCM integration, detect file change and indicates which files have been changed in source panel. - code map ...

want but have not encountered: - source panel file structure that allow me to open files in different apps of my choice. detects file type. - simple, un-confusing, customizable UI - all shortcuts need to be customizable ...