I'm pretty sure I have a list longer than Shana's, so I'll just list the last few I've enjoyed.
Code Geass was good, great story line, good character buildup, excellent plot. Then I watched through Gundam 00, which as far as gundam series go, is one of the best there is, even surpassing Wing. Now I'm in the middle of Fullmetal Alchemist: Brother hood, I love it, saw the first series, like this one better (I squealed when Roy fought Lust) and Shangri-la which is an interesting post-apocalyptic anime with a MtF trans as one of the main characters, interestingly enough.