I cannot recommend this tool highly enough.
It's called LastPass and it plugs right into your browser, syncs across multiple devices, and most importantly, makes it ridiculously easy to securely save all of your passwords.
What's more, you can share your password with friends without actually giving them the password.
Say, I want to let you log in to some site that I use (maybe register my kid for camp, I don't know).
Instead of emailing you the password (not so good), I "LastPass" it to you. You accept it and can log in...but you never actually know the password.
What's more, it's allowed me to get more secure in choosing my passwords and remember the various iterations I use or must (1 cap, 1 number, 1 symbol or whatever).
Seriously, I love it.