I typically use my new AlBook 15" on a desk in my living room, next to my keyboard/music equipment. I was surprised when I bought it that I was getting only about 50-60% signal strength, when my other computers (some PCs, but also a PowerMac G4 MDD Dual1G) usually averaged 80% in the same location. Moving the screen (antenna are on either side of the LCD) didn't effect the signal strength much if at all. After loading Tiger, I find my signal strength is back up to 80-85%. Instead of two bars indicated on my Menu Bar icon, I now get four bars. I haven't seen others indicating this, so I'm wondering if this is an actual improvement to Airport Extreme or if it's simply reading signal strength accurately now.