To Indent or not Indent?

Reblogged from Imagineer-ing:

That is the question at the heart of this post.

When writing a novel or novella, do you indent, or not?

What are the reasons you have for that?

I'm curious here, as I have been copying style, and a good friend has suggested not indenting.  So, which is your preference, and is there any particular reason?

An interesting question