EVERY Final Fantasy (that I've played) is Star Wars! (spoilers)
Seeing as there's been one in FFVIII and FFIX forums, I might as well just tell you that they all have some Star Wars stuff in them. As I've said before, they obviously had a fan among the FF team.
Obviously Necron uses one of Yoda's lines in FFIX.
The revelation of the true identity of Sin is mildy comparable to the revelation of Darth Vader, despite the fact that the two characters are nothing like each other. The real simularity is Tidus' reaction to it. There is also the Dark Knight (I think? It's been a while) in FFII, who is no one's father, but he is related to someone.
Biggs and Wedge show up in a few games, and Piet(sp?) appears in VIII, Red XIII is literally pronounced "Red 13" which may refer to the Red Squadren (all of which are numbered).
The phrase "I have a bad feeling about this... appears in Star Wars, and Final Fantasy a few times.
There's always at least one character who has some kind of supernatural skill, this is the force, in a sense.
Thorn (as in Zorn and Thorn) in FFIX spoke in strangley constructed sentances. So did Yoda.
You can see remains of the Star Wars ships in the dessert in FFX.
Some say, that "Nannaki" is an anagram - I'll reserve that until I check the proper translation.
FFVII has a character called "Cait SITH" - I have heard somewhere that this is a mistranslation of "Cat She", but seeing as "Stray" was a mistranslation of "Cait Sith" this is ver doubtful.
FFIV's "Red Rings" are the Red Squadren.
The music played at the start of FFIV is somewhat similar to Star Wars music.
FFVI has an airship called the "Falcon", probably named after the Millenium Falcon.
"Aren't you a little short for an Imperial Soldier?" in FFVI, very similar to a line in Star Wars.
There is a place in FFX ten called "Luca" - that's just one letter away from "Lucas".
I'm sure there's more. FF and FFV haven't been singled out yet (not played FFIII).