Date: 14th March 2004 - July 2008
World Champions: Eddie Guerrero, John "Bradshaw" Layfield, John Cena, Edge, Rob Van Dam, Randy Orton, Triple H, Chris Benoit, Batista, Kurt Angle, Rey Mysterio, King Booker, The Undertaker, The Great Khali
Other Stars: Shawn Michaels, Chris Jericho, Shelton Benjamin, Carlito, Ric Flair, John Morrison, Jeff Hardy, Umaga, Santino Marella, Chris Masters, CM Punk, Kofi Kingston, Bobby Lashley, Finlay, Mr. Kennedy, Montel Vontavious Porter, Matt Hardy, Christian, Dudley Boyz, Billy Kidman, Paul London, Brian Kendrick, The Miz, Mark Henry, Big Show, Kane
This was the era where the young guys broke through the glass ceiling.
Ohio Valley Wrestling for most of the 2000s was WWE's development territory where they developed young wrestlers with hopes that they would become stars. The mid-2000s were when they all came into the WWE and became major players.
Cena, Orton, Batista, Benjamin, Carlito, Morrison, Umaga, Marella, Masters, Punk, Lashley, Kennedy, London and Kendrick all honed their skills down there and would go on to become important players in the WWE.
Of course they still relied on guys from the early 2000's like Triple H, Edge, The Hardys, Christian, Jericho, Guerrero etc. They all gelled well together.
For me, this is my favourite era as I was a teenager and understood it more than when I was a kid during the Attitude Era.