Well, you all like to not mark spoilers. Luckily, I've seen all of/don't plan on seeing everything posted so far.

.hack//SIGN had some pretty neat scenes. Anything with Subaru pretty much rocked, especially when she and Tsukasa were walking around holding hands and she was all tattered and such.

Sailor Moon has some pretty great scenes. Like when Usagi sees Mamoru get impaled by Zoicite and she re-awakens.

Also, the Fight of Ten Warriors or whatever that episode was called in R when the Senshi fight the Wierd Sisters and Moon protects Chibiusa and it's all "OMG EMOTIONAL".

Queen Beryl vs. Queen Serenity = amazing too. Even in the English dub it was great. Actually, I prefer the voice acter in the dub in that scene, she's much more emotional and moving ;o~