Christian Heilmann gives advice on how to succeed on the open web. He recommends focusing on building for the web using existing web technologies and APIs rather than proprietary systems. Specifically, he suggests starting with Yahoo! Query Language (YQL) to build and test APIs by accessing and combining data from various web services and sites. By making APIs and data openly available, it can help developers and others build on your work, which in turn helps gain recognition and an audience on the web. Overall, the key is leveraging existing web technologies and standards through open collaboration rather than trying to do everything alone or reinventing the wheel.