Prime-Time viewership numbers compiled by Nielsen Media Research for May 7-13. 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, 28.2 million viewers.

2. (1) ''American Idol'' (Tuesday), Fox, 25.47 million viewers.

3. (6) ''House,'' Fox, 21.36 million viewers.

4. (6) ''Grey's Anatomy'' ABC, 19.58 million viewers.

5. (5) ''Dancing With the Stars'' (Monday), ABC, 19.44 million viewers.

6. (4) ''CSI: Crime Scene Investigation,'' CBS, 18.75 million viewers.

7. (10) ''CSI: Miami,'' CBS, 17.18 million viewers.

8. (12) ''Dancing With the Stars Results'' (Tuesday), ABC, 16.86 million viewers.

9. (9) ''Desperate Housewives,'' ABC, 16.13 million viewers.

10. (16) ''Without a Trace,'' CBS, 14.31 million viewers.

11. (19) ''NCIS,'' CBS, 13.88 million viewers.

12. (16) ''Survivor: Fiji,'' CBS, 13.76 million viewers.

13. (X) ''Survivor: Fiji Finale,'' CBS, 13.63 million viewers.

14. (38) ''King of Queens,'' CBS, 13.42 million viewers.

15. (16) ''Two and a Half Men,'' CBS, 13.27 million viewers.

16. (22) ''Criminal Minds,'' CBS, 12.92 million viewers.

17. (23) ''CSI: NY,'' CBS, 12.83 million viewers.

18. (15) ''Lost,'' ABC, 12.11 million viewers.

19. (38) ''Brothers and Sisters,'' ABC, 11.61 million viewers.

20. (X) ''Survivor: Fiji Reunion,'' CBS, 11.43 million viewers

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