THE BEST CAMERA is the one you have with you. For me, that's my iPhone 3GS. I love having a decent camera with me at all times — and lately I've been especially enjoying Camera+ the $2 iPhone app.
Photos are captured in a lightbox, allowing me to shoot almost continuously. The app has convenient post-exposure controls and a variety of cool filters. I love posting images to Flickr, Twitter and Facebook immediately after they're shot.
Here are a few favorite photos captured with my iPhone:
Because my photos turn out so well, I find myself shooting and experimenting with levels and filters all the time. Here's a full set of images captured on the iPhone.