Here's a list of recommended software for OSX for those new to the OS. Not this is aimed at a core list of useful utilities, rather than a massive list, so keep additions that are useful to Redbrick folk who have just got a Mac.
http://iterm.sourceforge.net/ iTerm - An alternative to the default terminal.app that comes with OSX
http://cyberduck.io/ Cyberduck - SCP client, to allow to upload files to Redbrick
http://www.adiumx.com/ Adium - A free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
[A dashboard widget of the o2sms script, by mackers@netsoc.
https://www.virtualbox.org/ VirtualBox - Software to allow you to run Windows and others OSes under OSX
http://www.apple.com/macosx/bootcamp/ Bootcamp - Sets up a dual boot configuration with Windows or OSes