Looks like we'll need to come up with some kind of project page explaining this transition: http://meta.wikimedia.org/wiki/Single_login_specifications. According to Meta, we'll be moving to "single login" within the next few weeks, so everyone is encouraged to make sure their passwords and e-mail addresses are up-to-date and consistent across the various projects. (Accounts with identical names, e-mail addresses, and passwords across different projects will be easiest to deal with.)