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.
A really cool deb / apt package dependency visualiser. It's a demo, but can be used by running "PageController.makeRequestAndPlot('PackageName');" in a firebug console.
The Ubuntu package list. One can find .debs to download here.