Fueled by the stellar debut of its new reality series Boot Camp, Fox took top-rated honors among the all-important adult 18-49 demographic last week with the XFL-muddled NBC tied with ABC for third. Although the alphabet network reached the most number of viewers (12.74 vs. 12.73 million for Survivor-driven CBS), a less-potent Who Wants to Be a Millionaire means ABC was down compared to last year at this time. Over at UPN, with WWF Smackdown! on the upswing (8.1 million viewers), the male-oriented weblet bested the WB. The top five shows of the week were: Survivor: The Australian Outback, ER, CSI: Crime Scene Investigation, Who Wants to Be a Millionaire (Tuesday) and Friends.