YMail
I am, as of today, an official developer on the YMail.app project. Hopefully in the next couple of weeks you’ll see the app moving forward, with at the very least, a version that works with the latest version of Yahoo! Mail.
To make things more interesting, this is not an official Yahoo! product
One of the things that I find difficult about using my Mac for study is the amount of distractions. Simply by being connected to the internet means there is a whole world of procrastination waiting for me.