Using Aspect Oriented Programming in Ruby to simplify tracing

Is their a simple way to automatically insert a trace function
invocation at the start or every method of a rails app? I want to use
SimpleTrace to an IO stream or logger.debug to the log file to output
each invoked method's name and the arguments it's called with, at a

I understand that's an easy thing to do with Aspect. I see that
there's a patch to Ruby 1.8.2 that introduces a Cut that implements AOP
for Ruby.

Has anybody used it? And I wonder whether it would do what I want to
do. (I only skimmed it's description.)

Is there some other implementation "out there?"