Wow, the Gawker and Sony hacks have created an incredible opportunity to analyze people's use of passwords. Two thirds of the (granted, only 88) accounts in common between the two hacks used identical passwords!
I often use the same password for sites I don't really care about. This does not mean I use the same password on my work / banking / eBay / paypal accounts.
This might explain why so many people used the same password for Gawker and SonyPictures.
I think this should be the main point. The sites you care about (email, facebook) should have a unique password. The sites that don't matter can have a login with your common password.
This is much more reasonable than asking everybody to remember 50 unique passwords.
And you have to take into account that (as he also mentions) these dbs came out in a different time. Which might skew results quite a bit. They could have been changed in the meantime. When you get a password database you want to know how many passwords are the same at that precise moment...
