Also keep in mind different sites have different manufacturers.
I order my first 5M from http://www.solarbotics.com/product/6052 (Adafruit reseller). And the color order is RBG using the LPD8806 library and default example code. Someone on here helped me reverse them in the lpd8806.h code to make it work
I ordered another 5M from ledlightinghut.com of lpd8806 and this strip is NOT backwards.. it's the correct RGB order using the default library and code.
This makes using these strips together impossible without coding them separately.