Haskell JPEG decoder

Here's a simple Haskell JPEG decoder. The cool part about it is that the web page that describes the program is the actual source code -- it's a literate haskell program that happens to also be a web page. The program doesn't handle color images, so it's more of an executable tutorial than an actual library for handling jpegs, but it's still pretty cool. I love the fact that the program's "comments" have embedded images.