You won't believe how useful #1 can be!
Sometimes at Odoo, we try to make the job of partners and developpers easier. Things like easy messaging integration, easy tracking, easy website publishing. Maybe you didn't know about all this. After this talk, you will.
Add messaging abilities to any object with mail.thread
Track your website visitors with the utm mixin
Add a rating system to any object with the rating mixin
Be accessible from the outside by mail using the mail.alias mixin
Easy website visibility control with the website.published mixin
Date & time