A9 is Amazon's search engine, and if you haven't yet seen it, I suggest you check it out. In particular you should checking out some of their cool interface features - I’m interested in the drag and drop functionality and resizable tables in particular. I've glanced a few times at the code - it isn't obfuscated, although it isn't commented - so many people will be able to read through and understand how this works.
A couple of things of note:
I won't be going through the A9 code line by line, but rather will be writing something from scratch - might take a month before I've got something worthwhile to post.
Many people have posted comments / suggestions and questions to by Google Suggest Dissected article, I've read everything, but have been too busy to respond to most of the comments - I'll try spend a night in the next 2 weeks answering some of these great questions in another blog entry.