In 10.6 when you opened a new tab in Terminal.app it opened to your home directory. In 10.7 a new tab in Terminal.app opens to your current working directory (from any previous tabs). I found this feature to be annoying, as I already have a command that will do it when I want it, and I prefer the old 10.6 behavior.
Luckily, this is a preference in Terminal.app and can be easily changed.
An emacs keyboard macro is just a recording of user input into emacs, which means that most anything you can do in emacs can be recorded as a macro. Read that again. Pretty powerful.
LiveReload applies CSS/JS changes to Safari or Chrome without reloading the page, and automatically reloads when the html changes. Let that soak in for a minute. In this post I'll go over how to get it installed and working on your Rails projects.
Occasionally I type a password or other sensitive information into a shell prompt. Using bash history, the command can be removed.
In this post I explain how to host your side project on Heroku for free. There are some limits of course. I'm assuming your side project is written in Ruby (RACK compatible), Node.js, or Clojure. I'm assuming you're using git for version control (heroku uses git push for deploys). I'll also discuss storage limitations (database, web assets, etc).