http://en.wikipedia.org/wiki/3D_optical_data_storage
In a nutshell, Terabyte-level storage on an optical disk the size of a DVD or Blu-Ray. Holy $hI%! Even if this doesn't come out in 2010, this is some impressive technology that could really shake up how we store our data. More than likely this will be for large corporations and tech-hobbyists, but still. Amazing.