Very good pictures.
I generally use the P mode on my FZ5. It does everything automatically, but gives you more menu options I believe, like changing the ISO, changing the white balance and many others. Simple mode is a good way to start learning the basic funcitons of the camera, but you're definitely missing out if you leave it there. I found (and everyone else seems to back this up) the best way to learn all of the features is to read the manual. Then read it again. I find myself always referencing it for something.
Thanks for sharing the photos, and please continue. I found that as I continued to shoot and look for advice, my skill went up. This board right here has made a big difference in my photo quality. There are some real pros on here.