[Haskell-cafe] Functional vs Imperative

[Dhaemon]

Hello,
I'm quite interested in haskell, but there is something I don't 
understand(intuitively). I've been crawling the web for an answer, but 
nothing talks to me...
So I was hoping I could find some help here:
"How is evaluating an expression different from performing action?"
I'm puzzled... Doesn't it amount to the same thing? Maybe I have a wrong 
definition of "evaluating"(determine the value of an expression)?
Examples would be appreciated.
Also, just for kicks, may I had this: I read the code of some haskell-made 
programs and was astonished. Yes! It was clean and all, but there were "do"s 
everywhere... Why use a function language if you use it as an imperative 
one?(i.e. most of the apps in http://haskell.org/practice.html)

Thanks in advance,
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