Archivists at Bowdoin College in Maine use lobster netting as a storage material to preserve delicate drawings and maps. (via The Chronicle of Higher Education, subscription required)
I have to admit, on a very loosely related note, one of the things I loved about the DaVinci Code movie, a film that got so many things wrong based on a book that got so many things wrong, was the glimpse of the shelves of the "Magdalene archives" in Rosslyn Chapel at the end. The earliest mansucripts, in scroll form, are stored on diagonal shelves. So at least they got something right.