Developers of SemanticWeb applications face a challenge with respect to the decentralised publication model: where to nd statements about encountered resources. The \linked data" approach, which man- dates that resource URIs should be de-referenced and yield metadata about the resource, helps but is only a partial solution.We present Sindice, a lookup index over resources crawled on the Semantic Web. Our index al- lows applications to automatically retrieve sources with information about a given resource. In addition we allow resource retrieval through inverse- functional properties, oer full-text search and index SPARQL endpoints.