I would have to say my all time favorite is Eureka 7, followed by Clannad. What's yours?
edit 1: holy crap over 1000 replies! I see we have tons of otakus here. Haha! Keep it up!
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Hmmm... Top 5 5. Cowboy bebop 4. Trigun 3. Angel beats 4. Steins gate 1. Elfin lied [spoiler]It was really hard to make a list.[/spoiler]