This is a *great* post. Thank you! And just reading everyone's response 
helps so much!

@zimbtam, One request: Can you please post this as a wiki somewhere? 
That way people can add to it as they go.

Some of mine:

1. A (somewhat) philosophical resistance to Enumerator.next? or 
Enumerator.has_next? IMO, reaching the end of iteration is not an 
exceptional condition, but Ruby treats it that way. So much so that 1.9 
adds a method in Kernel (loop) that squelches the StopIteration 
exception but continues to not provide this method.

2. Sometimes, I  do think that Strings not being immutable bites in odd 
ways. I wish (sometimes) Strings were treated like Fixnums.

More as I run into them.

Regards,
Kedar

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