How to tab between buttons on an Mac OS X dialog box

I know that there has been a similar question asked here very recently, but I was wondering if it was possible to tab between buttons on default Mac OS X dialog boxes?

I already have the All controls option enabled in System Preferences → Keyboard & Mouse → Keyboard Shortcuts, but no joy.

Solution 1:

If you enable Full Keyboard Access by setting it to all controls, you should be able to tab between options and select by hitting spacebar, at least for OS X 10.5:

Solution 2:

While @ruddzw's (chosen) answer works, it can slow you down in other areas simply from the sheer number of controls there are to tab through.

@NReilingh presents a different approach, and the semantics behind it:

The right way to go about keyboard shortcuts for alternate dialog buttons is not tab, but command key combos. For example, Command-period is almost universally "cancel." [...]
It's often not documented, but the command shortcut for different buttons that aren't the default button or cancel is usually the first letter of that button.

So in the example:

• enter/return will Save,
• ⌘+. or esc will Cancel, and
• ⌘+D will map to Don't Save.
  As @Kevin Reid points out, ⌘+delete works here as well.