What OS? What edtior? Why?

What OS do you use when programming?
What text editor do you use?
Why?

Operating System:
UBANTO

Editor:
The editor that comes with that Emacs thing.

Why:
Windows XP annoyed me, so I switched to Linux. I eventually got to Emacs after getting trolled by /prog/ and reading SICP (halfway there), thus partially attaining enlightenment and learning to Lithp. If I'm doing work in ENTERPRISE languages, I'll wrest the code from whatever ugly and bloated IDE you're supposed to.