I've been experimenting with running multi-term in emacs instead of using an external program like iTerm2. While multi-term is good, it can have some show-stopping problems out of the box. As usual, EmacsWiki has some good tips, but there isn't a comprehensive setup all on one page.
View a short demo of this integration on youtube.
About 3 months ago I switched to a new 15" retina macbook pro. My previous OS X install was nearly 4 years old. I did not want to clone the data over because too much cruft had built up. I was left with the question of how to quickly and easily setup a laptop for programming work. I chose Boxen because it was new, and I wanted a repeatable process for machine setup.
You may have seen my previous post on Learn Emacs: Fit your Workflow. I've improved the function to bring up a full frame eshell buffer, and restore back to previous window configuration with less code. Previously I was using some complex keyboard macros to try to restore my specific usual frame setup. This rewritten function will work for any frame setup.
I owe this tip to magnars' emacs configuration.
More on registers here
Emacs 24.3 was released today. If you're on OS X, the easiest way to check it out is by downloading a build from EmacsForMacOSX.
As for what's new in Emacs 24.3, in true Emacs fashion, we can ask it directly.
M-x view-emacs-news
If you're using Smex M-x will suggest other view-emacs-* commands.
So next time you're wondering about how to do something in Emacs try asking it directly.
M-x info-emacs-manual
Will view the Emacs manual as info pages.
The visor I refer to is a feature of TotalTerminal.