Do you have one (or more) of these friends?

Do you have one (or more) of the friends that when you talk or write only wants to talk about themselves.  I'm noticing this trend more and more lately.  At first I thought it was just a one time thing or that something big was going on for them, but then I realized that it wasn't an isolated incident; certain people only want to talk about themselves.  I completely understand that we are all guilty of this occasionally, but when it happens over and over, it's a bad habit.  So a message to all self-involved people out there:  Your friends notice that you only care to talk about your life, and it starts to wear down friendships when you don't want to hear about what is going on with your friends.  Listening can be a very important skill.