$ cat package.json 
{ "name": "pg",
  "version": "0.6.17",
...snip

$ node -v
v0.6.11

$ uname -a
Darwin March-1-2012-Air.local 11.3.0 Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64 x86_64

$ node exampleapp.js 

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: Cannot find module '[...snip]/node_modules/pg/lib/native/../../build/default/binding'
    at Function._resolveFilename (module.js:332:11)
    at Function._load (module.js:279:25)
    at Module.require (module.js:354:17)
    at require (module.js:370:17)
    at Object.<anonymous> (/[...snip]/node_modules/pg/lib/native/index.js:12:12)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)
    at Function._load (module.js:308:12)
    at Module.require (module.js:354:17)

    $ ls node_modules/pg/build/
    Release     c4che       config.log