The inaugural results of TiVo"s (NASDAQ:TIVO) demographic measurements effort bear out the long-held assumption that users fast-forward through commercials, and further defines who skips what. The general practice of skipping ads was consistent across all demographics, but the specific ads that were skipped varied between households with relative predictability. Toy ads got more eyeball time in households with kids 12 and younger; political ads and hair tonic shills received more attention from the over-50 set. TiVo, the Alviso, Calif., digital video recording pioneer, launched its Power Watch demo-based ratings service in May, using 20,000 volunteer households. Only passive viewing was required--no diaries, log-ins or special boxes. The Power Watch service is a companion to the Stop Watch behavioral and viewership ratings service launched nearly two years ago.