Description of problem:
$ npm

module.js:340
    throw err;
          ^
Error: Cannot find module 'inherits'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/usr/lib/node_modules/npmconf/npmconf.js:3:16)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)


Version-Release number of selected component (if applicable):
npm-1.3.6-4.fc18.noarch
nodejs-0.10.14-1.fc18.x86_64
nodejs-abbrev-1.0.4-6.fc18.noarch
nodejs-ansi-0.2.0-1.fc18.noarch
nodejs-archy-0.0.2-8.fc18.noarch
nodejs-asn1-0.1.11-3.fc18.noarch
nodejs-assert-plus-0.1.4-1.fc18.noarch
nodejs-async-0.2.9-2.fc18.noarch
nodejs-aws-sign-0.3.0-1.fc18.noarch
nodejs-block-stream-0.0.7-1.fc18.noarch
nodejs-boom-0.4.2-2.fc18.noarch
nodejs-child-process-close-0.1.1-2.fc18.noarch
nodejs-chmodr-0.1.0-4.fc18.noarch
nodejs-chownr-0.0.1-9.fc18.noarch
nodejs-cmd-shim-1.1.0-3.fc18.noarch
nodejs-combined-stream-0.0.4-3.fc18.noarch
nodejs-config-chain-1.1.7-1.fc18.noarch
nodejs-cookie-jar-0.3.0-1.fc18.noarch
nodejs-couch-login-0.1.17-1.fc18.noarch
nodejs-cryptiles-0.2.2-1.fc18.noarch
nodejs-ctype-0.5.3-3.fc18.noarch
nodejs-delayed-stream-0.0.5-5.fc18.noarch
nodejs-devel-0.10.14-1.fc18.x86_64
nodejs-editor-0.0.4-2.fc18.noarch
nodejs-forever-agent-0.5.0-1.fc18.noarch
nodejs-form-data-0.1.0-1.fc18.noarch
nodejs-fstream-0.1.24-1.fc18.noarch
nodejs-fstream-ignore-0.0.7-1.fc18.noarch
nodejs-fstream-npm-0.1.5-1.fc18.noarch
nodejs-github-url-from-git-1.1.1-2.fc18.noarch
nodejs-glob-3.2.6-1.fc18.noarch
nodejs-graceful-fs-2.0.0-2.fc18.noarch
nodejs-hawk-1.0.0-1.fc18.noarch
nodejs-hoek-0.9.1-1.fc18.noarch
nodejs-http-signature-0.10.0-3.fc18.noarch
nodejs-inherits1-1.0.0-11.fc18.noarch
nodejs-inherits-2.0.0-3.fc18.noarch
nodejs-ini-1.1.0-3.fc18.noarch
nodejs-init-package-json-0.0.10-1.fc18.noarch
nodejs-json-stringify-safe-5.0.0-1.fc18.noarch
nodejs-less-1.3.3-4.fc18.noarch
nodejs-lockfile-0.4.0-1.fc18.noarch
nodejs-lru-cache-2.3.0-3.fc18.noarch
nodejs-mime-1.2.10-1.fc18.noarch
nodejs-minimatch-0.2.12-2.fc18.noarch
nodejs-mkdirp-0.3.5-3.fc18.noarch
nodejs-mute-stream-0.0.4-1.fc18.noarch
nodejs-node-uuid-1.4.0-5.fc18.noarch
nodejs-nopt-2.1.2-1.fc18.noarch
nodejs-normalize-package-data-0.2.1-1.fc18.noarch
nodejs-npmconf-0.1.2-1.fc18.noarch
nodejs-npmlog-0.0.4-1.fc18.noarch
nodejs-npm-registry-client-0.2.27-2.fc18.noarch
nodejs-npm-user-validate-0.0.3-1.fc18.noarch
nodejs-oauth-sign-0.3.0-1.fc18.noarch
nodejs-once-1.1.1-5.fc18.noarch
nodejs-opener-1.3.0-7.fc18.noarch
nodejs-osenv-0.0.3-5.fc18.noarch
nodejs-packaging-4-1.fc18.noarch
nodejs-promzard-0.2.0-6.fc18.noarch
nodejs-proto-list-1.2.2-5.fc18.noarch
nodejs-qs-0.6.5-3.fc18.noarch
nodejs-read-1.0.5-1.fc18.noarch
nodejs-read-installed-0.2.3-1.fc18.noarch
nodejs-read-package-json-1.1.1-1.fc18.noarch
nodejs-request-2.25.0-3.fc18.noarch
nodejs-retry-0.6.0-5.fc18.noarch
nodejs-rimraf-2.2.2-1.fc18.noarch
nodejs-semver-2.1.0-1.fc18.noarch
nodejs-sha-1.2.1-1.fc18.noarch
nodejs-sigmund-1.0.0-5.fc18.noarch
nodejs-slide-1.1.4-1.fc18.noarch
nodejs-sntp-0.2.4-1.fc18.noarch
nodejs-tar-0.1.18-1.fc18.noarch
nodejs-tunnel-agent-0.3.0-1.fc18.noarch
nodejs-uid-number-0.0.3-7.fc18.noarch
nodejs-which-1.0.5-8.fc18.noarch

The only thing which might be unusual is that I installed the nodejs-requests update directly from Bodhi (https://admin.fedoraproject.org/updates/nodejs-request-2.25.0-3.fc18) but I can't say if npm did work before the update.