14. The content delivery system as recited in claim 12 , further comprising: a cost determination mechanism constructed and adapted to measure a cost of delivering resources from each of the set of shared repeater servers to the particular client machine, the cost determination mechanism for use in selection of the at least one shared repeater server.
12. The content delivery system as recited in claim 11 , further comprising: a load determination mechanism constructed and adapted to characterize load on the set of repeater servers for use in selection of the at least one shared repeater server.