Shamelessly taken from the Champions Official Site...

"Atari and Cryptic are proud to announce the official Preorder promotions from retailers across the United States. In addition to specific exclusive promotions for each retailer, all preorders (from any retailer) will receive guaranteed access to the Champions Online open beta, beginning August 17th. All purchases also include 30-days of free play and five Cryptic Points to be spent in-game.

GameStop

GameStop is offering access to the Early Start Program, giving customers who preorder a few days headstart in the game before its official launch on September 1st! In addition, all preorders include the exclusive Insectoid Airfoil costume piece and the Experimental Anti-Graviton Generator flight travel power at character creation.

Wal-Mart

Wal-Mart offers a Limited Edition Package with collectible lenticular cover, which also includes a zone map, iron-on decal, and ten additional Cryptic Points.

Best Buy

Best Buy offers access to the Early Start Program, along with an exclusive action figure in-game and a damage resistance item.

Amazon

Amazon preorders receive five additional Cryptic Points, and three exclusive costume pieces: Harlequin Headpiece, Black Knight Helmet, and Grenade Chest Strap."

I like the flying early on but the Cryptic points and costume pieces sure are tempting.