I've actually started reading the translations of the original novel version of the Suzumiya Haruhi series by Tanigawa Nagaru.
If you aren't watching the anime(though I think everyone should, whether you like anime or not) here's what it's about.
Boy meets girl. Girl turns out to be nuts. Boy discovers girl has hidden powers, which attracts aliens, time travelers, and espers. Many relationships begin. Hilarious consequences.
I've finished the first volume, and the beginning of the second one because the rest hasn't been translated. I'm trying hard not to spoil myself by reading translated chapters from later volumes.