Solar flare would be awesome for coders. Some huge percentage of enterprise applications no longer have source code (they're just binaries with the code lost to the ages).
All those binaries destroyed with the disks and insufficient disaster recovery would have to be rewritten!
Thanks for the link! Hadn't heard of that, although I've seen similar reasoning in other contexts. (Basically, the most reasonable estimate, absent other data, is that you are at the mean -- so, for example, one could reasonably guess that half the people to ever be born have been born at present.)