As I'm younger than many regular posters the 1990 World Cup is the first one I remember at all, and even then I don't recall actually seeing any of it; I just remember my school headmaster handing all the students little fold-out guides. I know I filled in the results as the little guide stayed in a drawer or box at home for years afterwards.
I remember USA 94 pretty well, and how entertaining it was seeing unfancied Bulgaria dispatch the hated Germans in the quarter-finals. I'd never heard of any of the players although Stoichkov quickly became a star, but looking at them in my Panini album they were a rum bunch. Trifon Ivanov!
The clearest memory is of Yordan Letchkov - portrayed in the UK media as some random baldie, but actually one found out later an experienced and successful Bundesliga and Ligue 1 midfielder - scoring that diving header winner.
I also remember Romania doing well at that tournament, and their entire squad seemingly being bought up by lower-table Premiership outfits, almost all of them completely flopping in England.
And of course apart from the obvious Bobby Baggio, you had Romario and Bebeto (and the baby thing which basically kickstarted the craze for choreographed celebrations), Maradona coked up to the eyeballs against Greece, and that Saudi guy scoring a preposterous goal against Belgium.