magic.js

var FS = require('fs'),
    PATH = require('path');
var libs = {};

// Include node's built-in modules
// NOTE: process.binding is a node private API, this means it may change without notice.
Object.keys(process.binding('natives')).forEach(function (name) {
  libs[name] = name;
});

// Include libs in the require paths
require.paths.forEach(function (path) {
  if (PATH.existsSync(path)) {
    FS.readdirSync(path).forEach(function (filename) {
      var fullPath = PATH.join(path, filename);
      if (FS.statSync(fullPath).isDirectory()) {
        if (PATH.existsSync(PATH.join(fullPath, "index.js"))) {
          libs[filename] = fullPath;
        }
        if (PATH.existsSync(PATH.join(fullPath, "index.node"))) {
          libs[filename] = fullPath;
        }
        return;
      }
      var p = filename.lastIndexOf('.');
      var extension = filename.substr(p);
      if (extension === '.js' || extension === ".node") {
        libs[filename.substr(0, p)] = fullPath.substr(0, fullPath.lastIndexOf('.'));
      }
    });
  }
});

// Set up lazy loaders
Object.keys(libs).forEach(function (lib) {
  var name = lib.toUpperCase();
  var path = libs[lib];
  var code = function () {
    // When called, replace the property with the real deal
    delete global[name];
    return global[name] = require(path);
  };
  global.__defineGetter__(name, code);
});

usage.js

require('./magic');

// Assuming Connect is in your require.paths somewhere...
// The first reference to "CONNECT" will require('connect') and replace
// the CONNECT variable with the module itself.
CONNECT.createServer(CONNECT.logger(), CONNECT.staticProvider(__dirname)).listen(8080);
SYS.puts("Starting magical connect server at http://localhost:8080/magic.js");