It looks like his blogging engine is removing some of the code. A few lines are not valid Haskell, and GHC indeed complains about them.

But anyway, a "working" version is not much longer than this. Haskell's threads (or rather, MVars and Chans combined with purity) are really a joy to work with. If you haven't tried writing a small app like this, you should.

I always get nervous when I see Haskell/MzScheme/etc bits about "Here's how to make a web server!" or "This is how you parse JSON!".

Where's the "this is how you make a blog in 15 minutes", where the blog's code looks as well thought-out as the Haskell Prelude?

Not to say that the aforementioned topics aren't important; they are, but what is there at a higher level?