ABC's Dancing With The Stars continued to dominate on Monday night, averaging a 12.8 rating and a 19 share between 8:00 p.m. and 9:30 p.m. Many of the shows on other networks, however, saw significant ratings erosion. CBS's Two and a Half Men at 9:00 p.m. dropped to an 8.4/12, down 24 percent from the comparable Monday a year ago. Likewise, the network's CSI: Miami was down 18 percent to a 10.1/16. NBC's new comedy Chuck saw its ratings decline to a 4.9/7 following its debut two weeks earlier with a 6.4/10. The network's new Journeyman dropped to a 4.8/7, a 29-percent plunge from its opening week.