Oh woooow, I really enjoyed it ^_^
Lets see, in rough order of enjoyment...
Puella Magi Madoka Magica is amazing! I've seen the whole series and it's my second favourite anime series (right behind The Twelve Kingdoms, which admittedly I haven't seen in years and I hope holds up to how I remember it...). Just everything about it...the music, variety of art styles, the way it deconstructs the genre so intelligently, the emotion, the concepts....squuueeeeee!
Death Note. Heh, I've actually watched the first episode twice now and yet haven't seen any of the others yet O.O This must be fixed soon! I've read the manga and ADORED it. I don't really have an addictive personality, but that stuff is addictive! And so intelligently done, the way Light and his descent in to madness is portrayed and the way he manipulates people and plan things out puts the similar case of Lelouch in Code Geass to shame.
Forgot how funny The Melancholy of Haruhi Suzumiya Episode 00 actually is
The cat! Completely forgot about that bit and it caught me so off guard
Actually watching through Kino's Journey at the moment. It's brilliant so far, a friend described it as being philosophical without being cloying which I agree with completely.
Wanna check out Haibane Renmei now! I'd only heard of it before, but really liked the first episode.
Spice and Wolf I've seen before (it was possibly my favourite series that was screened at Sci-Fi last year). I'm not sure why I don't love it more, but I do really like it and am looking forward to finishing season 2.
Angel Beats!...I used to really love it. I've seen the series twice now and its flaws get to me more and more. Everything about it feels so contrived just for the sake of making things more emotional, and it's so frustrating how the humour seems to almost undermine the emotional moments. But I can't deny that the emotional moments absolutely destroy me, and I love the themes it explores.
Cowboy Bebop...eh. I'm about 10 episodes in to watching it now and...it's fine. I guess this sort of episodic actiony stuff just isn't for me. The first episode is one of the better ones I've seen so far though.