1. Magnavox Odyssey - First System
2. NES - Games like Mario, Donkey Kong, and Zelda made games more popular
3. PS2 - Best games on any system, ever.
4. Wii - Likely saved gaming from another crash like in 1983 with its appeal to the casual market.
5. PS - Not the first disk based console, but definately the most popular
6. N64 - Had a lot of great first party titlex
7. Genesis - Gave Nintendo a good run for its money, good system. Even though the 32x and Sega CD sucked ass.
8. PS3/360 (tie) - Brought amazing graphics, and high definition movies into the mix.