Alright, I feel like an absolute idiot, but the question is simple, and 30 
minutes of looking hasn't yet yeilded the answer.

I want to take a float (say 0.0) and output it with a space in front if it's 
positive, - in front if it's negative, and be able to specify how many 
numbers after the decimal get printed (padding with zeros).  This will be 
used to output currency, and I just know there's a simple way to do it with 
Ruby, but not finding it. :-)

Sorry to bother you all.