Final Fantasy ranks up there with Mario as one of the most successful video game franchises ever to be conceived. I was personally a Phantasy Star fan back in the 8-bit days. Still, you gotta love music videos about Chocobos, RIGHT?
Also see the 8-Bit Theater and Final Fight Fantasy series pages.
There are TONS of one-off spoofs and tributes!
The "Mixed in Balamb" series has been a huge hit: