Komm Süsser Tod from End of Evangelion is one of the best songs I've ever heard, and it's oh so appropriately placed in the show.
Other than that, though...
Opening theme from Escaflowne
Just Think of Tomorrow and Downtown Dance from Tylor
The song that plays during the credits of episode 26 of SMJ-X
Funanori Sailor from Tylor
Kyosuke #1 from Kimagure Orange Road: Summer's Beginning
Ai No Tenshi from Perfect Blue
My Omelette from Dragon Half
Opening and closing themes from Kare Kano
Cruel Angel's Thesis from Eva
Those are my favorite anime songs.
--Guido
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