I'm torn about this idea, if it's actually serious. I'm very comfortable programming in Perl, and have written quite a few modules for IkiWiki, and it would be a huge pain to have to start from scratch all over again.
On the other hand, this could be a motivation for me to learn Haskell. My only encounter with Haskell has been a brief time when I was using the Xmonad window manager, but it looks like an interesting language. Functional programming is cool.
+There are a lot of interesting plusses for Haskell you note (in the parent page), but it's true that the idea is horribly daunting (as [[Joey]] said "If only I had a spare year"). Is there any way that you could "start small"? Because nothing will ever happen if the task is too daunting to even start.
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--[[KathrynAndersen]]