Right. Now the series is over, time for obligatory youtube videos and other links! WARNING: SPOILERS FOR THOSE WHO HAVEN'T SEEN THE SERIES YET (which is your own fault

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Liked the opening song, but want it creepier? How about sung a cappella by a girls' choir?
http://www.youtube.com/watch?v=iuwko1ycNEcAlso, if you want to see more awesome versions of canon, here are a couple of fanfiction recommendations:
(I acknowledge that 95% of fanfiction is crap. These two are at the top of the 5%)
Shinji & Warhammer 40K:
http://tvtropes.org/pmwiki/pmwiki.php/F ... rhammer40K Pretty much what it says on the tin. Shinji finds a set of Warhammer as a child and consequently grows up happy by the start of the series' timeline. Ridiculous amounts of awesome happen. Definitely worth a read for anyone familiar with 40k lore.
Nobody Dies:
http://tvtropes.org/pmwiki/pmwiki.php/FanFic/NobodyDies Probably my favourite fanfiction, and possibly my favourite thing on the internet. Essentially, Yui Ikari and Kyoko Zeppelin Sohryu (Shinji's and Asuka's mothers) don't die before the series. From this one point, huge swathes of backstory are altered. The story is awesome and hilarious but has its fair share of tear-jerkers, with some of its darker moments rivaling canon (Asuka is possibly WORSE off for her mother's survival). I would definitely recommend this to anyone who's seen the series, or even hasn't (I read this before watching it, and understood the plot perfectly).
Bear in mind both of these are quite long (ND is up to 110 chapters and counting), so don't start reading them right before exams, but they're definitely worth it (Nobody Dies especially).
(I like Nobody Dies. You may have noticed that

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"The enemy of my enemy is a problem for later. In the meantime, they might be useful."
"KIIIIIIIINGSLEEEEEEEYYYYY!!!"