speaking of remakes/homages/ripoffs/copies:

1) Seven Samurai

Magnicent Seven (and the 3 unofficial or official sequels)
Battle Beyond the Stars (Roger Corman sci-fi version of SS... Robert Vaughn has a role!)
some Hercules or Gladiator movie with Seven in the title - don't recall offhand

old man memory ... there may be some more

2) Yojimbo

A Fistful of Dollars
Bruce Willis in Walter Hill's Last Man Standing
David Carradine in the B-movie, probably straight to video - The Warrior and the Princess
Ti Lung in Shaw Brothers' Kung Fu Instructor


old man memory ... there may be some more