Next Book Club Book!
That gives you one month from today to read the manga.
If you have not read Air, broaden your horizons and pick up a manga you haven't before, and come discuss it with us. If you have read it, come discuss it with us anyway!
Here is the link to the manga online. Also check your library if you like. Most carry manga now, and Air is a particualrily popular title to shelve.
Also... if you have watched Air but not read it, that is different. Do read the manga, the anime story is noticably different than the manga.