16. A computer-readable medium that stores instructions executable by a computer, the computer-readable medium comprising: one or more instructions to identify documents in a network; one or more instructions to score the identified documents based on a model of a surfer who is likely to make random jumps from certain ones of the identified documents and to follow forward links from certain other ones of the identified documents; and one or more instructions to store the scores for the identified documents.
23. The computer-readable medium of claim 16 , where the model of the surfer is designed to weight links between pairs of the identified documents based on a measure of importance of the links within the pairs of the identified documents.