Take your camera everywhere, and that means everywhere!
Get into the habit of seeing something eye-catching, and taking out your camera to snap a shot.
Instead of keeping your 365 photos on your camera, try a photo sharing site (like Flickr or Photobucket).
Don't stop no matter what! You may think of giving up, but don't! You could always try a 52 weeks project. Instead of a photo every day, how about one every week? Or if you want, maybe a 12 months project.