Wow! Reading the new issue of Popular Science, there are now on the market by Maxell 300 GB disks meant for professional archiving. And they expect by 2010 to have 1.6 TB (that’s about 350 DVDs worth) drives. And they write data to the disks about 30 times faster than DVDs also.
The data is stored in 3 dimensions in a special gel that they say should last 50 years.
Wait, this is even better, go to Maxell from one of these links as I see the link in the C-Net article is broken.