gistfile1.txt

git/pow master > npm install --dev
npm info it worked if it ends with ok
npm info using npm@0.3.18
npm info using node@v0.4.5
npm info calculating sha1 /usr/local/lib/node/.npm/.cache/pow/0.2.2/package.tgz
npm info shasum ec39aba796d89362ffa0e67980b3eefd30600b4c
npm info range log@>= 1.1.1
npm info preinstall pow@0.2.2
npm info preinstall log@1.1.1
npm info preinstall async@0.1.7
npm info install pow@0.2.2

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
Error: Cannot find module '/usr/local/lib/node/.npm/pow/0.2.2/package/node_modules/coffee-script/bin/cake'
    at Function._resolveFilename (module.js:320:11)
    at Function._load (module.js:266:25)
    at Array.<anonymous> (module.js:423:10)
    at EventEmitter._tickCallback (node.js:126:26)
npm info pow@0.2.2 Failed to exec install script
npm ERR! install failed Error: pow@0.2.2 install: `node node_modules/coffee-script/bin/cake install`
npm ERR! install failed `sh "-c" "node node_modules/coffee-script/bin/cake install"` failed with 1
npm ERR! install failed     at ChildProcess.<anonymous> (/usr/local/lib/node/.npm/npm/0.3.18/package/lib/utils/exec.js:49:20)
npm ERR! install failed     at ChildProcess.emit (events.js:67:17)
npm ERR! install failed     at ChildProcess.onexit (child_process.js:192:12)
npm info install failed rollback
npm info uninstall [ 'pow@0.2.2',
npm info uninstall   'async@0.1.7',
npm info uninstall   'log@1.1.1' ]
npm info preuninstall pow@0.2.2
npm info preuninstall async@0.1.7
npm info preuninstall log@1.1.1
npm info uninstall async@0.1.7
npm info uninstall pow@0.2.2
npm info uninstall log@1.1.1
npm info auto-deactive not symlink
npm info auto-deactive not symlink
npm info postuninstall async@0.1.7
npm info postuninstall log@1.1.1
npm info postuninstall pow@0.2.2
npm info uninstall log@1.1.1 complete
npm info uninstall async@0.1.7 complete
npm info uninstall pow@0.2.2 complete
npm info install failed rolled back
npm ERR! Error: pow@0.2.2 install: `node node_modules/coffee-script/bin/cake install`
npm ERR! `sh "-c" "node node_modules/coffee-script/bin/cake install"` failed with 1
npm ERR!     at ChildProcess.<anonymous> (/usr/local/lib/node/.npm/npm/0.3.18/package/lib/utils/exec.js:49:20)
npm ERR!     at ChildProcess.emit (events.js:67:17)
npm ERR!     at ChildProcess.onexit (child_process.js:192:12)
npm ERR! 
npm ERR! Failed at the pow@0.2.2 install script.
npm ERR! This is most likely a problem with the pow package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node node_modules/coffee-script/bin/cake install
npm ERR! You can get their info via:
npm ERR!     npm owner ls pow
npm ERR! There is likely additional logging output above.
npm ERR! System Darwin 10.7.0
npm ERR! argv { remain: [],
npm ERR! argv   cooked: [ 'install', '--dev' ],
npm ERR! argv   original: [ 'install', '--dev' ] }
npm not ok
git/pow master > node node_modules/coffee-script/bin/cake install

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
Error: Cannot find module '/Users/jack/git/pow/node_modules/coffee-script/bin/cake'
    at Function._resolveFilename (module.js:320:11)
    at Function._load (module.js:266:25)
    at Array.<anonymous> (module.js:423:10)
    at EventEmitter._tickCallback (node.js:126:26)
git/pow master > ls node_modules 
ndns/

See this thread for an answer: basecamp/pow#20 (use 1.0 or higher of npm)