I have created a script to be used to install ADB and Fastboot on a Mac or a Linux computer. Simply run the script in Terminal or a like application and it will copy ADB and Fastboot to /usr/bin/ (for Linux it will install the android-rules, too). Also, in the ZIP is an uninstaller script to remove ADB and Fastboot (and for Linux, the android-rules).
Also, as of Version 3.1 this also installs the JDK for Linux-based systems.
While advanced users probably won't need this, it would be good for noobs who need help using the ADB and Fastboot commands.
You can see the source at GitHub
If you have any problems or errors, let me know.