I will agree that IO::All (with it's use of Spiffy) makes for some clean looking code. However, IO::All is just crammed with everything and the kitchen sink thrown into one module, and even a way to further extend it with plugins!

Spiffy itself is somewhat questionable in my mind as well since it does so many different things in one module. But after seeing how quickly ingy can whip out new Spiffy based modules, I am less bothered by that fact (usefulness almost always outweighs overly-anal-elegance).

Back to IO::All, I do have to say that it is very nice when you are writing quick scripts and tools. It takes the headache out of doing some very complex stuff when you just don't have the time to do it the "right" way (the "right" way being a subjective thing). But to use it for any serious sizable project IMO would be inadvisable.

But of course, this does not mean it is not good code to read :), in fact I rather enjoyed reading it (and learned plenty about obscure IO techniques as well). I would also recommend a look at Spiffy too, it has some rather interesting code in it as well.