I\'ve been learning about node.js and modules, and can\'t seem to get the Underscore library to work properly... it seems that the first time I use a function from Underscor
As of today (April 30, 2012) you can use Underscore as usual on your Node.js code. Previous comments are right pointing that REPL interface (Node's command line mode) uses the "_" to hold the last result BUT on you are free to use it on your code files and it will work without a problem by doing the standard:
var _ = require('underscore');
Happy coding!