May Sweeps 2009 Comparison Averages, Complete

Lost (9pm) vs. year-ago Supernanny 4.17 vs. 2.17 (+92%, 3 airings)
Mentalist vs. year-ago Shark 3.53 vs. 2.10 (+68%, 3 airings)
House vs. year-ago Bones 4.63 vs. 3.07 (+51%, 3 airings)
Hell's Kitchen vs. year-ago Don't Forget the Lyrics 2.90 vs. 2.27 (+28%, 3 airings)
BBT 3.50 vs. 2.93 (+19%, 3 airings)
NCIS 3.40 vs. 2.98 (+14%, 4 airings)
Supernatural 1.23 vs. 1.08 (+14%, 4 airings)
Lie to Me vs. year-ago 'Til Death/Back to You 2.53 vs. 2.23 (+13%, 3 airings)
Bones vs. year-ago 5th Grader 2.38 vs. 2.10 (+13%, 4 airings)
30 Rock 2.97 vs. 2.67 (+11%, 3 airings)
Reaper vs. year-ago B&tG 0.80 vs. 0.73 (+9%, 3 airings)
20/20 (10-11pm) 1.70 vs. 1.63 (+5%, 4 airings)
The Bachelorette (2 hrs.) 3.00 vs. 2.90 (+3%, 1 airing)
Christine/Gary vs. year-ago Price is Right 1.85 vs. 1.80 (+3%, 2 airings)
Ghost Whisperer 2.23 vs. 2.18 (+2%, 4 airings)
Criminal Minds (9-10pm) 3.28 vs. 3.23 (+2%, 4 airings)
HIMYM 3.65 vs. 3.63 (+1%, 4 airings)
2.5 Men 4.93 vs. 4.90 (+1%, 4 airings)
DWTS (8-9:30pm plus one-hr. finale, Mon.) 4.35 vs. 4.35 (even, 4 airings)
CSI: NY 3.23 vs. 3.23 (even, 3 airings)
60 Minutes 1.63 vs. 1.63 (even, 4 airings)
90210 vs. year-ago Reaper 1.03 vs. 1.03 (even, 4 airings)
Law & Order: SVU 3.80 vs. 3.85 (-1%, 2 airings)
The Office 3.80 vs. 3.87 (-2%, 3 airings)
Rules of Engagement (9:30pm) 4.00 vs. 4.08 (-2%, 4 airings)
AFHV (2 hrs., Fri.) 1.60 vs. 1.70 (-6%, 1 airing)
Flashpoint vs. year-ago Moonlight 1.83 vs. 1.98 (-8%, 4 airings)
Simpsons 2.90 vs. 3.15 (-8%, 4 airings)
American Idol (Wed. 9-10pm plus 2-hr. finale) 8.94 vs. 9.72 (-8%, 4 airings)
Gossip Girl 1.13 vs. 1.23 (-8%, 4 airings)
Numb3rs 2.03 vs. 2.23 (-9%, 4 airings)
CSI: Miami 3.75 vs. 4.13 (-9%, 4 airings)
American Idol (Tues.) 8.25 vs. 9.13 (-10%, 4 airings)
One Tree Hill 1.15 vs. 1.28 (-10%, 4 airings)
Castle vs. year-ago The Bachelor 2.40 vs. 2.67 (-10%, 3 airings)
America's Funniest Home Videos (Sun.) 2.15 vs. 2.40 (-10%, 2 airings)
King of the Hill 2.33 vs. 2.63 (-11%, 3 airings)
Smallville 1.40 vs. 1.58 (-11%, 4 airings)
Survivor 3.63 vs. 4.13 (-12%, 3 airings)
American Dad 2.70 vs. 3.07 (-12%, 4 airings)
ANTM 1.80 vs. 2.10 (-14%, 3 airings)
DWTS (9-10pm, plus two-hr. finale, Tues.) 4.00 vs. 4.68 (-15%, 4 airings)
Family Guy 3.10 vs. 3.63 (-15%, 2 airings)
(Wednesday 9pm Lost vs. year-ago Thursday 10pm Lost) 4.17 vs. 4.90 (-15%, 3 airings)
Grey's Anatomy (9-10 pm only) 5.28 vs. 6.28 (-16%, 4 airings)
Parks & Recreation vs. year-ago Scrubs 2.20 vs. 2.63 (-16%, 3 airings)
(House 8pm vs. year-ago House 9pm) 4.63 vs. 5.60 (-17%, 3 airings)
Ugly Betty 2.03 vs. 2.50 (-19%, 3 airings)
Cupid vs. year-ago WMC 1.57 vs. 1.93 (-19%, 3 airings)
Brothers & Sisters 3.03 vs. 3.80 (-20%, 3 airings)
Dateline (2 hrs., Fri.) 1.40 vs. 1.77 (-21%, 3 airings)
According to Jim (8-8:30 pm) 0.95 vs. 1.20 (-21%, 2 airings)
Law & Order 2.18 vs. 2.78 (-22%, 4 airings)
Cold Case 2.10 vs. 2.70 (-22%, 1 airing)
My Name is Earl 2.00 vs. 2.60 (-23%, 3 airings)
(8pm Reaper vs. year-ago 9pm Reaper) 0.78 vs. 1.03 (-24%, 4 airings)
(Thursday Bones vs. year-ago Monday Bones) 2.38 vs. 3.15 (-25%, 4 airings)
Medium (10pm) 2.33 vs. 3.10 (-25%, 3 airings)
(Tuesday Without a Trace vs. year-ago Thursday Without a Trace) 2.63 vs. 3.50 (-25%, 4 airings)
Desperate Housewives (9-10pm, plus 2-hr. finale) 4.52 vs. 6.04 (-25%, 4 airings)
Fringe vs. year-ago Hell's Kitchen 3.90 vs. 5.23 (-25%, 3 airings)
Dateline (7-8pm, Sun.) 0.97 vs. 1.30 (-26%, 3 airings)
According to Jim (8:30-9pm) 1.10 vs. 1.50 (-27%, 1 airing)
CSI 3.60 vs. 4.93 (-27%, 4 airings)
Extreme Makeover: Home Edition (8-9pm, plus 2-hr finale) 2.60 vs. 3.74 (-30%, 4 airings)
Private Practice vs. year-ago Lost 3.40 vs. 5.00 (-32%, 2 airings)
Southland vs. year-ago ER 2.00 vs. 3.05 (-34%, 4 airings)
24 (9pm) vs. year-ago House 3.28 vs. 5.65 (-42%, 4 airings)
(Friday Wife Swap vs. year-ago Wednesday Wife Swap) 1.35 vs. 2.35 (-43%, 2 airings)
(Thursday Hell's Kitchen vs. year-ago Tuesday Hell's Kitchen) 2.93 vs. 5.23 (-44%, 4 airings)

Note: Averages don't necessarily include every sweep airing of a show. I'm only including an airing if the show (or two shows being compared) aired both this year and on the year-ago evening.