While I dropped some test images and videos comparing the iPhone 4 and Droid X myself, I wanted to highlight and article over at tnkgrl Mobile which has more comparison info and a detailed write-up of the strengths and weaknesses in the cameras of each phone. If you are looking for a phone with a good camera, you are definitely looking in the right direction with the Droid X and iPhone 4, but between those two, finding which one fits you might just depend on which type of user you are.