We have rotated the free Champions for this week. I've also posted the Champions that will be free for the next week (and the ones we are thinking about making free the week after).
Annie Mage DrMundo Melee DPS Janna Mage Kassadin Melee DPS Kayle Tank MasterYi Melee DPS Morgana Support NuNu Tank Tristana Ranged DPS Twisted Fate Ranged DPS
Alistar Tank Anivia Mage Gangplank Melee DPS Shaco Melee DPS Sivir Ranged DPS Taric Support Twisted Fate Ranged DPS Veigar Mage Zilean Support Gragas Tank
Ashe Ranged DPS Blitzcrank Tank Heimerdinger Support Karthus Mage Nasus Melee DPS Ryze Mage Singed Tank Soraka Support Teemo Ranged DPS Pantheon Melee DPS
I've also slapped a chart at the end for number crunchers and history buffs. We're still reading suggestions for future weeks.