As jack of all trades I admin the Google Apps account for our company. Recently (believe September or October was the cutoff) Google Apps accounts became full Google Accounts. Before that, you could have different accounts with the same email and possibly password, but being very different accounts. In the process, they merged your Google App Account and the Google Account for your Google App email into one. It worked quite well, but was very confusing and sometimes spit out errors. I've got all four of us moved over, and having Google App account being a Google Account is much more logical.