Acknowledgement

We thank all participants in our measurement study. We especially thank Ted Kowalski of AT&T, Danielle Gallo of AT&T Research, Alex Brown and Milan Andric of UC Berkeley, Frans Kaashoek of MIT, and Mike Dahlin of UT Austin for generously offering their main Web pages for our study. We are grateful to Robert Szewczyk and Alec Woo for instrumenting the TinyOS Web page. We also thank Hyunseok Chang, Yuan Gao, Jason Hong, David Oppenheimer, Amit Sehgal, Wilson So, and Hao Zhang, who took part in our measurement using their personal Web pages.