The New York Public Library has aquired the literary and personal archive of Jack Kerouac:
The archive, the largest Kerouac holding in any institution, contains manuscripts, notebooks, letters, journals and personal items saved from the time he was 11 until his death at 47 in 1969. . . Meticulously organized by Kerouac himself, the archive comprises more than 1,050 manuscripts and typescripts, including novels, short stories, prose pieces, poems and fragments, a handful of them in scroll form; 130 notebooks for almost all of his works, published and unpublished; and 52 journals, from 1934 to 1960, which include material used in \"The Town and the City,\" \"On the Road\" and \"Big Sur.\"
More from the New York Times (registration required) and even more from the Boston Globe.
The NYPL has provided a bit more information on the contents of the collection here .