Oustanding little introduction to npm and how to use it. One trick, give your user access to /usr/local/ or /usr/lib/node_modules/ so npm doesn't need sudo. Nice.
Scripts to auto install node.js on Ubuntu. Includes a few handy dependencies, etc. Neat.
Handy article introducing chef and providing a few links. A little out of date now, but provides a useful intro.
Interesting article on how webpop built their infrastructure on Rackspace's cloud. Includes links to a few useful tools (chef, wormly, new relic, nagios, ganglia, and others).