Agreed, it's definately one of the best features of the Slim. Another feature that I love about the Slim, it the Flip-Top lid. All you have to do is solder an SPST switch to the button that signals wether or not the lid is closed, and you have an instant option for Swap Magic use. I bought a Mini-SPST switch and installed it right under the DVD drive, under the edge. It's barely noticable, and it works great.
And on another note, the early models of the Slim actually had modems too...