This morning I deployed New Relic's new Server Monitoring feature for the first time (I've used Scout previously). It's cool to see your server vitals right next to all your app vitals, and their interface looks attractive, to boot.
Since I deploy everything with Chef, I threw together a quick Chef recipe to automate the installation of New Relic's server monitoring agent. It has been tested with Ubuntu 10.04 LTS, and you can configure the license key in your Chef JSON config.
You can grab the recipe from my Chef recipe repository at Github.