This one I learned from a friend. She told me that when she was online a guy she once chatted with told her to check this site via chat by clicking on the link. The link would take her to what looked like a yahoo page. Little did she know that when she placed her user name and password she would be taken to a user and password collection. Long story short she got her email account compromised.
Dont save any passwords in your email box. If for some reason someone gets into your account they wont be able to do much damage other then you wont be able to access it.