I've just come to the shocking realisation that the best anime around at the moment, the sublime Lucky ☆ Star does not have a thread about it here. What's going on? You're all slipping!
This is a magnificently funny anime, based on a four-panel comic about Konata Izumi (Kona-chan) and her friends as they go through high school. So far, so Azumanga Daioh.
What really sets it apart, for me, is that it has a much stronger sense of humour, and it's filled with references to other anime (Kona-chan's ringtone, for example, is Hare Hare Yukai) and video games. While this forms the basis of much of the show's humour, it doesn't linger on it like, say, Excel Saga might.
On the other hand, it's more about jokes than story, so it doesn't have as strong a sense of overall plot as AzuDai does.
Oh, and it has a better dance than Haruhi Suzumiya.
Anyway, this is a really clever and funny series that everyone needs to be checking out right now. I'll leave the image spam up to someone else.