#2 - Play around with the setting so that the darkest shadows are black, and not washed-out.
#3 - If you go to the "blacks" section and fool around with the sliders, you can make your picture look vintage.
#5 - There are lots of presets you can choose from, and some are really cool.
#6 - To flatten your image, right-click a layer and choose "flatten image".
#7,8,9 - High Pass will make your images look sharper and crisper, without destroying image quality. Use this instead of the "sharpen" tools.