> It's unfortunate that the 2 different debuggers both use the word
> rdebug somehow in their invocation.... With the original debug.rb, you
> start debugging your program via 'ruby -rdebug' whereas with
> ruby-debug gem, you start debugging via 'rdebug'. This makes it more
> confusing than it ought to be.
>

With ruby-debug, I start debugging via the "debugger" method in my  
code, possibly conditional, in the exact place I want it. Couldn't be  
happier!