I use Readability and Instapaper for different things. With Readability, I use the Chrome extension to make articles readable in the same way Safari does on the fly.

With Instapaper, I save articles and read them later on my iPhone, and I get a collection of articles that I've saved sent automatically to my Kindle every Friday. Saturday mornings with my Kindle, saved articles through Instapaper and French Press coffee? Life is good.