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To add to @Stephens answer : we should also use no-follow in case where we have a well indexed page A having internal links of my site say B & C and these pages B & C are no-indexed means i don't want crawler to crawl them. According to google's recommendation if you have links on your page that are non-indexed, then a good practice is to let ...
I don't know about nofollow, But say something about dofollow. If your blog or site is big, you can use dofollow everywhere, and even in spam comments with links. There are many experiments with Google through years (Russian blog), and it's doesn't matter! (Dofollow or nofollow).
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