Since I got my iPhone 4 I find myself taking more and more photos on the phone and less on my DSLR. I'm less inclined to take my full camera gear when I go away for a weekend nowadays.
I'm still amazed how well the iPhone camera performs in good to middling lighting.
Along these lines, I'm quite disappointed in my Droid X. It's eight megapixels of mush, with washed out colors and fuzzy edges. I have to give Apple credit for managing to build a very reasonable camera into the iPhone line. My original iPhone 3G was a far better camera than my shiny new Droid X.