j2 Global Communications, Inc. (NASDAQ:JCOM)

One of the best run Internet companies I've ever investigated. They are the masters of metrics. They measure, analyze, and track every aspect of their business. They have recently been beefing up a sales force and focusing on larger enterprise customers (>1000 lines) instead of relying on their small business clientele and converts from their free service. They will play a role in the future of unified messaging. They own a global network of servers and 10M+ telephone numbers. Their core business is converting faxes to e-mail and network friendly formats. As long as somebody wants something in writing for their files the fax will keep breathing. JCOM has capitalized on this and allows businesses to continue using what they are used to while turning it into something that is network compatible. Single-handedly JCOM will extend the usefulness of facsimile as a communications medium. Did I mention that they throw off cash like a machine and continue to grow at 20% plus rates every quarter.