Before you plop down hundreds to a thousand plus dollars on your next digital camera upgrade, a nice digital SLR that you keep reading about, you might want to get some practice using the settings available with an SLR.
With a Flash-enabled browser, CameraSim will allow you to practice and learn what the lighting, distance, focal length, mode, iso, aperature, and shutter speed settings will have on your picture. Adjust the settings where you want them and snap a photo to see the results.
The bottom of the page will help teach you about the options and news says that there is a new version on the way. Check out CameraSim to see the flexibility that a digital SLR camera gives you to snap the perfect picture.