Ankur Jain assisted with the analysis of HTTP latencies. Herman Rao wrote the initial version of the bimodal proxy used in these experiments, Dave Korn and Kiem-Phong Vo wrote vdelta, and Dave Kristol wrote htd. H. V. Jagadish initially suggested the use of stale pages in conjunction with deltas. Robin Chen, Tony DeSimone, Dave Korn, Bala Krishnamurthy, Ankur Jain, Jeff Mogul, Doug Monroe, Sandeep Sibal, and the anonymous USENIX referees provided comments on earlier drafts of this paper.