Shortcuts for the application switcher in OS X

Solution 1:

• What about the shortcuts to actually go left / right (i.e. choose different applications) within the application switcher?

Release the Command+Tab keys when the highlight is on a selected app to switch to that highlighted app or with the Command key still pressed:

• tab – move selection to the right in the app list
• ` – move selection to the left
• h – hide the selected application
• q – quit the selected application
• mouse scrollwheel – move the selection back and forth
• left arrow – move selection to the left
• right arrow – move selection to the right
• up arrow – enter expose (Mission Control) within the selected application
• down arrow – enter expose (Mission Control) within the selected application

Source: http://osxdaily.com/2009/11/17/secrets-of-the-command-tab-mac-application-switcher/