http://www.webpop.com/blog/posts/building-a-scalable-cms-on-the-rackspace-cloud
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).
http://themomorohoax.com/2010/07/31/ruby-chef-tutorial
Handy article introducing chef and providing a few links. A little out of date now, but provides a useful intro.
http://howtonode.org/introduction-to-npm
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.
http://apptob.org/
Scripts to auto install node.js on Ubuntu. Includes a few handy dependencies, etc. Neat.