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it's definitely being worked on

http://www.yesodweb.com/ http://snapframework.com/ http://happstack.com/index.html http://blog.on-a-horse.org/

I am sure there are more.

Yes, although some of those are more "worked on" than others; the last entry at blog.on-a-horse.org is from almost a year ago, and the page at haskell.on-a-horse.org has been broken for a while.

Saying "some" is somewhat disingenuous as haskell on a horse is the only one not being actively developed at this time.

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