Since nobody mentioned it yet, most pictures in that thread are at f/3.5 or higher. Only two of them are f/1.8 (girl dancing). Yes, your camera and lens can handle such shots easily, but it is up to you to create them.
As for the extremely post-processed ("photoshopped") pictures, i think they are confusing and not helping, especially a beginner. Posting the originals along with these would be way more helpful to show what you can do with digital photography in general.
Layloo, i suggest reading up on the technical basics of photography like exposure, ISO sensitivity, shutter speed, aperture and depth of field. It's no big deal, just spend 5 minutes to understand what these things are and you will see how many options your camera gives you - getting them right is tha hard part! I'd say any beginner's website will do to get you started (avoid lengthy analysis with formulas and such, you don't need that). You can even read up a bit on composition tips for making your photos more interesting.
95% of the time Auto mode will give you good results, until you feel comfortable to take more creative control. Try to not use the flash unless there is no other option - you can experiment with it and see the difference. Experimenting is a good thing!