Chappy

One other thing is that different color schemes will give you a bit different look of Transparency. The level of transparency that Vista can achieve is basically locked, but the apparent transparency of your windows/borders will look different depending on your color selection.
For instance, a Frost or Default starting color will give you more apparent transparency when using less saturation, than will the Blue or Teal starting color. And that's another thing, the saturation level affects the "apparent" transparency too...you just have to play with things to find what you can achieve with your chosen starting color.