I agree with Shez and Cotton but...I really like that soulmate thing. Someone you spend eternity with? Over many lives/incarnations? Someone who makes you feel complete and never alone and never bored? Yeah, I like that idea. It's too nice an illusion to totally shatter it.
Other than children no, no love at first sight. Like Cotton said, that is attraction...or something. You have to really know someone before you can truly love them...that's just my opinion though.