The first week of the new fall season is history, and the big winners were CBS, NBC and the WB. CBS — buoyed by strong starts for CSI, CSI: Miami and Everybody Loves Raymond — was tops in households and total viewers. NBC, which had the week's most-watched show with Friends (33 million viewers), was No. 1 in all key demos. (NBC also scored with the Sunday premiere of American Dreams, which won its timeslot with 13.3 million viewers.) But the big story remains the huge year-to-year increases posted by the little Frog network that could. Compared to last fall, the WB is up 69 percent among young adults. "They can thank 7th Heaven, Everwood, The Gilmore Girls, Smallville, Reba and Charmed for this outstanding start," says Mediaweek's Marc Berman. ABC and UPN, meanwhile, were down dramatically.