Prime-time viewership numbers compiled by Nielsen Media Research for May 11-17. Listings include the week�s ranking, with viewership for the week and season-to-date rankings in parentheses. An �X� in parentheses denotes a one-time-only presentation.

1. (1) �American Idol� (Wednesday), Fox, 24.67 million viewers.
2. (2) �American Idol� (Tuesday), Fox, 22.71 million viewers.
3. (3) �Dancing with the Stars,� ABC, 18.55 million viewers.
4. (15) �Grey�s Anatomy,� ABC, 16.53 million viewers.
5. (7) �The Mentalist,� CBS, 16.21 million viewers.
6. (5) �NCIS,� CBS, 16.20 million viewers.
7. (4) �CSI: Crime Scene Investigation,� CBS, 14.81 million viewers.
8. (8) �Dancing with the Stars Results,� ABC, 14.06 million viewers.
9. (9) �Desperate Housewives,� ABC, 13.96 million viewers.
10. (13) �CSI: Miami,� CBS, 13.59 million viewers.
11. (17) �Without a Trace,� CBS, 13.4 million viewers.
12. (12) �Criminal Minds,� CBS, 13.37 million viewers.
13. (11) �Two and a Half Men,� CBS, 13.11 million viewers.
14. (X) �Survivor: Tocantins Finale,� CBS, 12.94 million viewers.
15. (X) �CSI: NY� (Special), CBS, 12.77 million viewers.
16. (19) �House,� Fox, 12.74 million viewers.
17. (16) �CSI: NY,� CBS, 12.33 million viewers.
18. (17) �Survivor: Tocantins,� CBS, 12.18 million viewers.
19. (36) �Biggest Loser 7,� NBC, 11.85 million viewers.
20. (X) �Survivor: Tocantins Reunion,� CBS, 11.59 million viewers.