Designing for Izzet by Mark Rosewater
U/R Izzet Philosophy, Strengths, and Weaknesses by The Mana Source
Beyond Izzet: Examining the Red/Blue Archetype by Seth Weinstein
Creative Differences by Mark Rosewater
Luis Scott-Vargas drafts blue-red in this video of the Hour of Devastation format.
As Foretold Turns
This deck uses a number of different cards that allow you to take an extra turn.