161 exabytes of information was generated last year according to a CBC.ca story, Time to learn your exabytes: Tech researchers calculate wide world of data by Brian Bergstein (March 5, 2007). That is way up from the estimate in How Much Information? 2003 that I blogged before. The study quotes John F. Gantz of IDC, but I can’t find the paper on the IDC site.
Wired News also has a version of the story, but again they link to the general IDC site.
Thanks to Matt amd Mike for this.