Tech's Best Young Entrepreneurs

David Ulevitch, 26

Company: OpenDNS

Funding: $2 million from Cnet (CNET) Founder Halsey Minor

Ulevich wants to change the way you call up Web sites. So his company, OpenDNS, has come up with what it considers a faster, smarter, and more secure method for translating requested URLs into corresponding sites. It helps companies guard against phishing schemes and bar employees from calling up adult sites. In less than two years OpenDNS has amassed more than 4 million customers, including 10,000 schools. The company is profitable and generates sales by displaying ads with search results.

Advice: "There are always people who do well even in a slump," says CEO Ulevich. "Focus on building great products for your customers and be flexible, because their needs may change. And free is certainly the right price."