I came across Postlight’s Mercury Reader not too long ago. It’s great for improving the readability of long articles and essays online. Soon after, I also found out that it can send such pages to Kindle! This is a really cool hack to be able to read long reads from the web on your Kindle, with all the nice formatting and fonts that you’re already used to.
The Parser behind their reader is now open-source too, which I thought was cool.
Related: Amazon also has a Send-to-Kindle via Chrome extension, but it doesn’t seem to work as well for me.