We've officially reached a point where most new job applicants have two general types of résumés. The first is the typical one-to-two page template-based résumé that's been popular for decades. The other is a more fragmented, digital, cubist-like résumé.
This second résumé stems from the many different personal fingerprints we leave on the Internet. Some are explicit and easily managed - e.g. LinkedIn and Facebook profiles. Others are semi-relevant and mainly controllable - e.g. Tweets. Finally, the least predictable and least manageable forms on Internet-based expression could potentially live on without our knowledge and control - e.g. old Instant Messenger conversations, etc.
I believe that we are seeing a rapid growth in Web-based communication that fits within the second and third categories of the second résumé - i.e. Twitter usage is steadily growing more relevant, location-based services that come with more advanced mobile technology are becoming widespread, etc. This means that it's becoming increasingly difficult to manage the second résumé. It also means that employers are increasingly relying on the second résumé as the main, true behavioral indicator.
Because of these trends, identity management will become a much bigger industry than most can foresee. Since millions of jobs will soon depend on one's Web activity, billions of dollars are at stake from controlling the second résumé.