Here are the last two Mays.
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2011:
Software (New Physical Retail only; across all platforms incl. PC)
01. L.A. Noire (360, PS3) Take 2 Interactive -
899K
02. Brink (360, PS3, PC) Bethesda Softworks -
401K [360/PS3 Only]
03. Lego Pirates of the Caribbean: The Video Game (Wii, 360, NDS, PS3, 3DS, PSP, PC) Disney Interactive Studios
04. Portal 2 (360, PS3, PC) Electronic Arts
05. Mortal Kombat 2011 (PS3, 360) Warner Bros. Interactive -
292K
06. Call of Duty: Black Ops (360, PS3, Wii, NDS, PC) Activision Blizzard
07. Zumba Fitness: Join the Party (Wii, 360, PS3) Majesco
08. NBA 2K11 (360, PS3, Wii, PS2, PSP, PC) Take 2 Interactive
09. Just Dance 2 (Wii) Ubisoft
10. Lego Star Wars III: The Clone Wars (Wii, NDS, 360, PS3, 3DS, PSP, PC) Lucasarts
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2010:
RED DEAD REDEMPTION 360 TAKE 2 INTERACTIVE May-10 945.9K
RED DEAD REDEMPTION PS3 TAKE 2 INTERACTIVE May-10 567.1K
SUPER MARIO GALAXY 2 WII NINTENDO OF AMERICA May-10 563.9K
UFC 2010: UNDISPUTED 360 THQ May-10 221.1K
UFC 2010: UNDISPUTED PS3 THQ May-10 192.3K
WII FIT PLUS W/BALANCE BOARD* WII NINTENDO OF AMERICA Oct-09
NEW SUPER MARIO BROS. WII WII NINTENDO OF AMERICA Nov-09
ALAN WAKE * 360 MICROSOFT May-10
POKEMON SOULSILVER VERSION NDS NINTENDO OF AMERICA Mar-10
SKATE 3 360 ELECTRONIC ARTS May-10
(*includes CE, GOTY editions, bundles, etc. but not those bundled with hardware)