Similar to Microsoft's fear of the open-source movement.
This inspiring article from Wired magazine, tells you why it would be great to work for this company, and why its competition just can't figure it out.
... what you see at the most popular job-search site: another wasteland of hypertext links, one line after another, without recommendations or networking features or even protection against duplicate postings. Subject to a highly unpredictable filtering system that produces daily outrage among people whose help-wanted ads have been removed without explanation, this site not only beats its competitors—Monster, CareerBuilder, Yahoo's HotJobs—but garners more traffic than all of them combined. Are our standards really so low?
But if you really want to see a mess, go visit the nation's greatest apartment-hunting site, the first likely choice of anybody searching for a rental or a roommate. On this site, contrary to every principle of usability and common sense, you can't easily browse pictures of the apartments for rent. Customer support? Visit the help desk if you enjoy being insulted. How much market share does this housing site have? In many cities, a huge percentage. It isn't worth trying to compare its traffic to competitors', because at this scale there are no competitors.
Each of these sites, of course, is merely one of the many sections of craigslist, which dominates the market in facilitating face-to-face transactions, whether people are connecting to buy and sell, give something away, rent an apartment, or have some sex. With more than 47 million unique users every month in the US alone—nearly a fifth of the nation's adult population—it is the most important community site going and yet the most underdeveloped. Think of any Web feature that has become popular in the past 10 years: Chances are craigslist has considered it and rejected it. If you try to build a third-party application designed to make craigslist work better, the management will almost certainly throw up technical roadblocks to shut you down.This is a great article, and reads really well.