What is a Blogroll To You?

I have questions for you guys;

a) How do you determine which blogs are going on your blogroll.   Do you have specific standards?

b) What determines whether you keep someone on your blogroll? Do you remove them after a time if they haven't posted/if you lose interest/etc?

c) Do you use your blogroll to personally remember the blogs you'd like to read or are you trying to let other people know what good blogs are out there? (I guess a better way of saying it would be 'Is it for you or for your readers?)

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I essentially use my blogroll to remind me to read blogs.   When I visit a new blog, if I like the first post I happen upon, I usually add that blog to my blogroll. Later, if they don't update for a long while or if I don't like further content I may remove them.  

That's all. I was curious.

:)

-C