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Re:How Lisp macros differ from static code-generation and me... by arethuza on Wednesday January 26, 2011 @12:32PM (#2144013)
You can also splice values into backquoted expressions using ,@foo rather than ,foo - which I seem to remember being rather useful.
Re:How Lisp macros differ from static code-generation and me... by zck on Wednesday January 26, 2011 @02:27PM (#2144655)
It's incredibly useful. The actual definition of until from Arc:

  (mac until (test . body)
    `(while (no ,test) ,@body))
It's really useful for bodies of code like this.