Looking good!
Yeah, the iPhone 4's camera is a big improvement over the previous generations. Unlike other phone cameras that boast about having more megapixels, Apple did it right by keeping it a reasonable 5 MP and increasing the sensor size. I've even used a couple iP4's images for publication. Just be sure to have the exposure nailed as the images can't take much tweaking before falling apart. (unlike a quality DSLR image)