Famitsu magazine has published Japanese video game sales data for the first and second quarters of 2005. Game-Science has translated several of these charts which can be viewed here. An excerpt is below:

    Software Sales - 2005 Q1-Q2
  1. PS2 - Gran Turismo 4 - 1,051,961
  2. PS2 - Shin Sangoku Musou 4 - 900,689
  3. PS2 - Dragonball Z3 - 639,950
  4. NDS - Nintendogs - 494,330
  5. PS2 - Winning Eleven 8 Liveware Evolution - 458,626
  6. PS2 - Romancing SaGa Minstrel Song - 443,005
  7. NDS - Sawaru Made in Wario - 398,380
  8. PS2 - Mobile Suite Gundam One Year War - 384,762
  9. NDS - Super Mario 64DS - 355,013
  10. PS2 - Tekken 5 - 314,845

    Hardware Sales - 2005 Q1-Q2
  1. PlayStation 2 - 1,286,882
  2. Nintendo DS - 1,236,268
  3. Sony PSP - 1,137,597
  4. Game Boy Advance SP - 497,931
  5. Nintendo Gamecube - 159,559
  6. Game Boy Advance - 16,040
  7. Microsoft Xbox - 9,045