Can you recommend a good connector format for small project boxes? I'm talking about connecting a project box to the outside world. Is there some standard? .1" spaced headers/plugs is a good standard for board-level stuff...I have a ton of plugs and headers I bought from Pololu. But for linking together project boxes, I want a plug format that I can standardize on. I'm willing to like, buy a crap-ton of them from sparkfun and just use them for everything to link stuff together. I know there are some molex connectors but they never seem standard. I thought about using 3.5mm audio plugs, because it's practically universal, but the problem is the jacks and plugs are kind of expensive and they momentarily short when you insert them. RCA jacks and plugs would work, but only make sense if your lines come in pairs.
I guess the true universal interface is screw terminals, but I don't know a source of panel-mount screw terminals either. All I can find is PC-mount screw terminals.
Another nearly universal interface would be banana jacks and plugs. Do you know where I can buy a bunch of banana jacks and bare plugs?
What do you use when you just need a pinout the the outside world?