1. A computing system, comprising: a user interface mechanism; a context identification system that detects a plurality of different sensor inputs, indicative of a plurality of different items of context, from a plurality of different sources of context; a cross-source search component that detects a trigger input and searches a plurality of different content sources, to identify a set of documents, based on the trigger input; a relevancy generator that generates a relevancy metric corresponding to each document in the identified set of documents, based on the plurality of different items of context; and a user interface component that controls the user interface mechanism to selectively surface the documents in the set of documents based on the corresponding relevancy metric.