Is there any way at all to make the eq bars invisible while keeping the sliders? If there is I would REALLY like to know how. It sure would make skins a lot more visible...

It depends on what your skin is like. If the equaliser window is a constant colour all across, you could colour the equaliser bar the same coloue, so that when it is placed over the equaliser window, it can't be seen.

However, if you are using some typr of image as a background then you can't do it, because Winamp repeats that one bar for each slider in the equaliser, so the background behind one slider won't be the same as any of the others.

No. Only if the eq backround and the sliders both have the same colour, but that's not what you want.