My current top 7 would be...
1. Higurashi no Naku Koro ni
2. Witchblade
3. The Melancholy of Suzumiya Haruhi
4. Ouran High School Host Club
(a lot of thinking)
5. xxxHOLiC
6. Ah! My Goddess (Yeah, it's not ongoing but it's good and I'm watching it at the moment, so what the heck.)
Can't think of the 7th one.
Listing my all-time-favorites is just impossible. I'm rather easy to please when it comes to anime, so my top 7 would probably end up as being top 70 if I started writing them. Well, uh, I'll mention some.
Haibane Renmei, for being unlike anything else I've watched.
Madlax, I don't know... It's just good. Very good.
Juuni Kokki
Scrapped Princess
Full Metal Panic? Fumoffu!
GINGA NAGAREBOSHI GIN,
I just couldn't restrain myself. I got to put this here for nostalgic reasons.
I'd like to put Noein up there as well but I've not seen all the episodes yet. Hmm, is it just me or did a lot of people miss this show or something? It just surprises me that nobody ever mentions it.