OS: Any Unix/Linux will do
Source/Version Control: Whatever is used where I have to do some work
Editors: vi(m), no plugins
At the end of the day, I really only need some ssh, screen, a halfway decent shell, any versioning and a vi.
Also: Pen and paper to take notes and ANY simple GUI to run a browser is appreciated.
If I can have it, I'll take it all in UTF-8, please. :)
Go on to reading the Toyota management style in itself, there's a couple of books about it, that's what many IT techiques are getting their ideas from.
It's mostly about finding your values so to speak and pinpoint what you really think makes up a good software development company - maybe your focus will be on organization, maybe on other things, so get an overview first.
These two articles are hopefully also an interesting nudge to think about many things:
http://www.computerworld.com/s/article/9137708/Opinion_The_u...
http://alistair.cockburn.us/Characterizing+people+as+non-lin...
O'Reilly has a very interesting book with analysis which practices actually work and why/how - sadly I also forget the title. There's for example a chapter about when and why pair programming works and when and why not.
Also, just watch carefully and learn to notice "good organization" - happens in surprising corners and niches and try to see WHY it's good.