Organic Data Storage...

Researchers at Harvard University have stored an entire book (more than 5 megabits of data) in artificial DNA – and read the book back out.  This storage technique has very high density, and (at least theoretically) archival storage time measured in centuries or even millenia.  There is one small drawback at the moment: read/write times are on the order of days.  They'll need to speed that up by a few orders of magnitude before we can write off rotating magnetic storage and flash memory storage...