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 Arashi Sora: 6/11/2015 9:07:26 AM-10/10- 1. Ergo Proxy 2. Puella Magi Madoka Magica 3. Psycho-Pass 4. Fate/Zero 5. Angel Beats 6. Code Geass -9.5/10- 7. Steins;Gate 8. Death Note 9. Monster 10. Terror in Resonanace 11. Future Diary 12. Anohana 13. The Melancholy of Haruhi Suzumiya -9/10- 14. Ga-Rei: Zero 15. Neon Genesis Evangelion 16. From the New World 17. Attack on Titan 18. Sword Art Online II 19. Sword Art Online 20. Aldnoah Zero 21. Darker Than Black Season 1 22. Clannad 23. Clannad: AfterStory 24. Nagi no Asuka 25. Kanon *note: This list may be slightly out of date, since I just copy/pasted my notepad document, but it's a few months old. I need to reconsider some of these maybe add in a few anime i've watched recently.