• Garrett Camp, the architect behind StumbleUpon.com. This downloadable toolbar gives users the opportunity to surf more than 10 million interesting sites that their friends or other users with similar interests have "stumbled upon."
• Tadayoshi Kohno, an assistant professor of computer science and engineering at the University of Washington. Kohno invented systems-oriented provable security, which examines all things at the systems level.
• Tariq Krim of Netvibes, a free Web service that lets users build customized, dynamic Web pages based on their interests. The pages can include a variety of modules from search modules to blog RSS feeds to competing news sites.
• Anna Lysyanskaya, an assistant professor of computer science at Brown University, who helped improve online privacy by developing a secure Web site login method that uses zero-knowledge proofs. She also created algorithms that avoid the enormous computing power usually required by zero-knowledge proofs to generate and test credentials more efficiently.
• Kevin Rose, founder and chief architect of Digg, a news site that aims to democratize digital media by featuring user-selected stories. Users post stories, then the Digg community votes on whether they like them or not, resulting in a constantly shuffling list of what interests users most (see IC's special issue article about Digg on p. 16).
• Luis von Ahn, an assistant professor of computer science at Carnegie Mellon University. Von Ahn created CAPTCHAS, or Completely Automated Public Turing Test to Tell Computers and Humans Apart, which appears on screens as strings of distorted characters that users are asked to type in to prove they're human and not malware. Von Ahn created CAPTCHAS for Yahoo in 2000 to battle automated email account registration. Now, he's trying to use CAPTCHAS to help digitize millions of books to make them searchable online.
• Mark Zuckerberg, Facebook CEO. The social networking site started in 2004 as a way to share personal profiles and photos with other Harvard students.