How can I apply the same CSS style that is being used by my Rad Controls onto another control like a asp:label? Ex. I have all of my Rad controls set to use the Black skin and I want all of my standard asp:labels to have the same text/font/etc that is being used by Rad-Slider
You can always utilize a tool like FF Firebug or Chrome's Developer tools to inspect elements and create css classes that utilize the same styles (font, color, etc.) as the elements that you want to emulate that are appropriate to that particular element, and then apply that class to those elements.
That is, at least, what I have done when it is appropriate or necessary.