Originally posted by Smokey:
If you really want to get good, learn how to shoot that sucker in manual mode, ie. learn about metering, shutter speeds, and f-stops, and then set all that stuff yourself. It takes a little time but will be worth it in the end. As far as ISO goes, set it as low as possible while still keeping your shutter speed hand-holdable. Take a shot indoors with flash at ISO 100 and then at ISO 1600, zoom in and look at the difference, it should be pretty noticable. For portraits or just pics of people or anything where you really want to draw the viewer's eye to the subject, use an open f-stop (f2.8, f3.5, etc.) but make sure you focus on the subject. For lanscapes use as small a stop as possible, (f18, f22).
I agree, but only to a point. It's always useful to have the technical skills, but not for everyday picture-taking. You need to know it when there are special conditions such as low light, fast action, night shots, or extreme closeups, because your camera's automatic settings don't work as well. That's when the knowledge makes the difference between getting a great shot and possibly not getting a useable shot at all.
IMO, using the automatic settings frees your mind to focus (pun intended) on interesting subjects and good composition, which are - assuming your camera is using proper exposure - the elements that make for extraordinary photos.
This is especially true with the latest cameras. Look at the thread-starter's pics. For the most part, the exposure looks good and the color is phenomenal. I have the original Digital Rebel, and last year we bought my wife a Canon PowerShot SD750. The PowerShot's picture quality (exposure and color rendition) absolutely blows my Rebel out of the water. There's no comparison. My point is that advances in camera technology have lessened the need to know the technical aspects of photography.
The technical side is a lot easier now, but you still have to be able to visualize the result in your head and use your tools (camera, light, etc.) to capture it.
Specific to the thread starter's questions, a couple of recommendations: watch your horizons (2nd pic is slightly tilted), and the pics of the temple or whatever are good examples of a case where the camera's auto settings didn't use the best exposure because of the bright overcast sky. In the last pic, the composition needs work; there's a foot protruding in from the right side and the female subject would probably appreciate it if you waited till her cleavage was less exposed.

That shot is too wide IMO, it would be better if it was tighter on the woman and child with some of the koi pond showing for context. Also note the bright glare off the water. A polarizing filter can help you with that and with getting better looking skies. Google it and you'll find lots of advice on buying and using polarizing filters along with before/after examples.
That brings me to one last piece of advice: don't ever get discouraged, and keep learning and practicing.
Good luck and have fun!