bjosephs:
Can someone check to see if the following libraries/examples work or at least compile?
It's pretty easy to just download Arduino 1.5.2, add the library, select Due from Tools > Boards, and click Verify. No hardware purchase necessary! (at least to know if it merely compiles)
Just for fun, I tried one of the libraries just now. ADXL455_Example.pde definitely does not compile. The first error I hit was it depends on WProgram.h, which Arduino hasn't supported since 0023. I edited that to Arduino.h, but then it depends on pre-1.0 stuff from the Wire library. I didn't go any farther. This probably won't work on ANY Arduino board using any version of Arduino newer than 0023.