On the web, several key emerging technologies are shaping the landscape and creating for members of web-based communities a whole new experience. In particular the semantic web, web services, The Grid and related technologies are on their way to transform the way users interact on the web. As an illustration of this potential transformation, we propose in this article the application of the semantic web technology to a new breed of web-based community called weblogs. For convenience, parts of the content of blogs are described in the Rich Site Summary (RSS) format to be automatically read by an aggregator called a feed reader. However, the enormous number of blogs on the web makes it difficult for a single person to track down all documents of interest on a particular subject. To assist a blog user, we developed a search service based on the semantic web technology.