If you’re not already using password management software, you should be. It’s an extremely bad idea to use one password for more than one service, which makes remembering all those passwords difficult. With a password manager, you only have to remember one password: the one that allows access to all your other passwords.
I’ve been recommending Password Corral for years. Bruce Schneier’s Password Safe is also excellent. These are both desktop programs. I don’t recommend using an online password manager, because there’s always the possibility that the service itself could be hacked.
Unfortunately, even as we collectively get better at keeping ourselves secure, nefarious hackers shift their focus to more fertile ground. Now, it appears that they are targeting password management tools. It’s easy to see why: if a hacker can break your master password, they will have access to all of your other passwords.
Recommendation: if you are using a password management tool, make sure your master password is long and unique.
Update 2014Nov27: A post on the Duo Security blog has additional details.