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Summary form only given. After 15 years of extensive research efforts, multimedia retrieval has final come to its prime time when everything becomes accessible on the Web. However, Web search both provides a new paradigm and poses challenge to multimedia retrieval research. It calls for a rethinking of the traditional content-based approaches, especially in how to make use the massive but noisy meta-data associated with Web pages and links. In this talk, we will first review some familiar approaches in content-based multimedia retrieval and examine their limits. We will then present a few new efforts in web multimedia search to illustrate some new thoughts in this space.