Late last year, the founders of Business.com handed James Gilliam, now their chief technology officer, a hairball of a problem: build from scratch an operating system to neatly browse more than 300,000 companies, divided into 25,000 industry categories and over 1 million pages. And keep in mind that the number of categories, like rabbits, will constantly expand. It took him less than two months. Lucky for them, Mr. Gilliam, though only 23, had already given the matter of information retrieval a good deal of thought. Read the whole article.