Here is my guess for the top 50 current gen games in terms of sales, with release dates (estimated) for the top 10

1) Halo 3 (360) (Sept 25) 3,780,000

2) GTA IV (360) (Oct 17) 3,430,000

3) Wii Play (Wii) (Feb) 2,590,000

4) Madden NFL 08' (360) (August) 2,350,000

5) Super Mario Galaxy (Wii) (September) 2,180,000

6) Heavenly Sword (PS3) (August 7. 2007) 1,985,000

7) GTA IV (PS3) (Oct 17) 1,900,000

8) Ratchet & Clank (PS3) (November) 1,750,000

9) Metroid Prime 3 (Wii) (August) 1,595,000

10) Madden NFL 08' (PS3) (August) 1,565,000

11) Guitar Hero 3 (Wii)  1,500,000

12) Assassin's Creed (360)  1,460,000

13) Warioware: Smooth Moves (Wii)  1,400,000

14) Big Brain Academy (Wii)  1,359,000

15) Guitar Hero 2 (360)  1,330,000

16) Wii Health (Wii)  1,300,000

17) Metal Gear Solid 4 (PS3) 1,280,000

18) Guitar Hero 3 (360) 1,240,000

19) Pokemon Battle Revolutions (Wii) 1,220,000

20) Elder Scrolls IV (360)  1,200,000

21) Wii Music (Wii)  1,140,000

22) Smash Brothers Brawl (Wii)  1,100,000

23) My Sims (Wii)  1,050,000

24) Too Human (360) 1,000,000

25) Crackdown (360) 965,000

26) Mario Party 8 (Wii)  895,000

27) Oblivion (360) 860,000

28) LostPlanet (360) 799,000

29) GRAW 2 (360) 780,000

30) Gears of War (360) 760,000

31) Super Paper Mario (Wii) 740,000

32) Guitar Hero 3 (PS3) 718,000

33) Tom Clancy (new 360 version) 700,000

34) Lair (PS3) 678,000

35) Ninja Gaiden Sigma (PS3) 640,000

36) Blue Dragon (360) 611,000

37) Bioshock (360) 600,000

38) DDR Hot Mix (Wii) 588,000

39) Mario & Sonic at the Olympics (Wii) 577,000

40) Mass Effect (360) 549,000

41) Disaster: Day of Crisis (Wii) 537,000

42) Harry Potter (Wii) 519,000

43) Alanwake (360) 510,000

44) Madden 2008 (Wii) 479,000

45) EA Playground (Wii) 467,000

46) Soul Calibur Legends (Wii) 455,000

47) Devil May Cry 4 (PS3) 440,000

48) The Simpsons Game (360) 435,000

49) Spiderman 3 (360) 430,000

50) Devil May Cry 4 (360) 428,000

I consider Wii Sports a game, though I see it more as a demo. It really shows what the Wii can do with sport related games. As for the question at hand, definately World Wide best seller will be Pokemon Diamond/Pearl. US sales will be close between GTA IV and Halo 3, though I expect GTA IV FTW. In Japan, it will surely be... does it matter. It is going to be a Nintendo game anyway.

As always, The Source, you have interesting posts. But, I do have a question: 6) Heavenly Sword (PS3) (August 7. 2007) 1,985,000 7) GTA IV (PS3) (Oct 17) 1,900,000 Why do you think GTA IV will be outsold by Heavenly Sword on the PS3? Is it due to the difference in release dates? Also, the likelihood of MGS4 coming out this year keeps diminishing.

Er... Source, that's a great list, but don't you think Forza 2 should be on there somewhere?

The Source, that is the problem with making long lists, instead of just naming a few titles. The more names you put up, the more discussions/disputes arise.

GTA IV could have an advantage here being multiplatform but i don't know it's too close to call. Halo 3 might end up selling more copies than GTAIV on the 360 platform, but sales from PS3 GTAIV will put them overall ahead of Halo 3. i think Pokemon Diamond will probably be the best selling game since it's got the head start. by the time those games come out, Pokemon will have sold more than 3 million copies and i'm sure the holiday season will boost sales even more. then of course you have Madden. that game will always sell alot of copies.