The 2008 Kansas City Chiefs' offense was catered around inexperienced quarterback Tyler Thigpen.
The "Pistol" formation made Thigpen more comfortable and the Chiefs actually moved the ball at times to make the best out of a dire situation.
Former tight end Tony Gonzalez was the focal point of the offense and was once again the best player at his position in the NFL.
In 2009, the Chiefs will have a completely new look on offense under new head coach Todd Haley.
Haley was the offensive coordinator for the NFC champion Arizona Cardinals last year.
The Chiefs also traded for franchise quarterback Matt Cassel and signed wide receivers Bobby Engram and Terrance Copper to bolster their aerial attack.
Although Thigpen played surprisingly well when pressed into duty, he either didn't have the ability or the coaching staff didn't trust him to make every NFL throw.
Cassel should allow the Chiefs to vastly expand their playbook in the upcoming season.
Here's a list of five plays you will see in 2009 that you didn't in '08:
Wide Receiver Screen Pass: Haley and the Cards used this play as an extension of the running game. Dwayne Bowe is no Anquan Boldin, but he does have good RAC (run after catch) capability.
Running Back Draw (4-Wide): Considering that Devard Darling and Jeff Webb were the teams number three and four receivers just might explain why the Chiefs didn't go four-wide very often in '08. The Cards ran this play a lot with Edgerrin James and Tim Hightower last season. Larry Johnson and Jamaal Charles are every bit as talented.
Flee Flicker: Kurt Warner touched up a few defenses for big plays with this one in the past. If "LJ" were to get it rolling, don't be surprised if he were to flick it back to Cassel for the deep bomb.
Deep Seem Pass: This play was a staple of Arizona's run to the Super Bowl. Larry Fitzgerald may have been the reason why, but the only time the Chiefs went to the seem last season was when Thigpen chucked it up to a double-teamed Gonzalez. Cassel has the arm for the pass, but will he have a receiver to run the route?
Deep Out: The deep out is considered the true mark of an elite NFL quarterback. The Chiefs probably didn't have that last season, but they do now. After taking over for an injured Tom Brady ironically against the Chiefs in week one, Cassel proved he can make all the throws while leading the Patriots to 11 victories.