[plt-scheme] Literate scribbling question

I'm struck by the simplicity of literate Haskell:

  http://www.haskell.org/haskellwiki/Literate_programming

  In haskell, a literate program is one with the suffix .lhs rather
than .hs. ... to distinguish between code and non-code portions ...
prepend all code with a >

No weaving etc. Very simple to use. Haskell people sometimes write
blog posts in this style, so you can just copy and paste the code to
get it running. Sure, it is less powerful than the traditional LP, but
perhaps people don't really need that power.

N.