Welcome. You've come to the right place. I'll attempt a quick answer.
2004-2005 Rocket Standard with various SE packages. Silver engines.
2006 Rocket Standard and Classic and some SE packages. Mostly black engines with some leftover silver.
2007 Rocket Standard, Classic and Classic Tourer. Std and Classic had black engines and the Classic Tourer (basically windshield and bags as part of base package) had leftover silver engines.
2008 Rocket Standard and Classic and the introduction of the Rocket Touring (not to be confused with the Classic Tourer).
2009 Basically no changes
2010 Standard and Classic dropped and introduction of the Roadster. Roadster tuned for more power and torque. Touring model unchanged.
2011-2012 mostly unchanged with the addition of ABS on both models.
That's mostly correct.