I definately have a few favorite Star Wars quotes...in no particualr order, they are:
Yoda: "Do or do not, there is no try" - obviously I love this quote enough to make it my sig

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Ben Kenobi: "The Force is what gives a Jedi his power. It's an energy field created by all living things. It surrounds us and penetrates us. It binds the galaxy together" - an awesome quote I use to tell others about the force at school.
Ben Kenobi: "The Force will be with you, always."
Ben Kenobi: “You can’t win, Darth. Strike me down, and I will become more powerful than you could possibly imagine.”
Han Solo: "Look, your worshipfulness. Let's get one thing straight. There is only one person I take orders from. Me."
Han Solo: "Get in there! Get in there, you big furry oaf, I don't care what you smell!"
Leia: "It's a wonder you're still alive. Will somebody get this big walking carpet out of my way?"
Darth Vader: "I find your lack of faith Disturbing."
Count Dooku: “I sense great fear in you, Skywalker. You have hate… you have anger… but you don’t use them.”