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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Edited by Jrockin11: 3/4/2015 7:09:09 PMDefinitely Sword Art Online, it was my first and I'm still in love haha. But after that probably Death Note