Do you have a note book filled with usernames and passwords? Maybe you have a monitor surrounded with Post-It notes that have passwords written on them?
There is a better and much more secure way of storing usernames and passwords. That better way is using a password safe such as KeePass.
KeePass allows you to store all your usernames and passwords in one secure, encrypted, password protected file. Other KeePass features include storing website addresses for all your usernames and passwords, password expiration date reminders, a password generator, the ability to touch one button and have your username and password entered for you, and many more.
KeePass is 100% free and can be downloaded from http://www.keepass.info/.
KeePass works on Windows, Linux, and Mac OS X computers. There is even a version of the software for the iPhone and Android smart phones.