Ah, Nostalgia

This past week I took a little trip down memory lane while watching videos over at YouTube.  I came across some cartoon intros and started to watch.  Most I have seen while others I haven't.  That started to remind me of the ones I watched when I was younger and some I catch today.  So, my beloved f-list, I'm wondering what favourite animated series do you have.  They can be fairly recent or from a few years ago.  I'm really interested to learn what they are.