Ooh! I'm on both ends of the spectrum here (and a bunch of bikes in between too)!

My road bike is a Trek Madone 5.9SL. With pedals, PowerTap wheel, and cages it weighs in at 15.2 -- almost too light in my opinion. It's sub-15 with my carbon race wheels.

My touring bike is a Rivendell Atlantis (lugged steel). Loaded to tour, it's about 80 pounds (yes, I overpack sometimes).

I'm pretty proud of my cross bike too! It's a titanium Ritchey Break-away. With race wheels it's just under 16 pounds -- unheard of for a cross bike. I could go lighter if I added a carbon bar and stem, but why bother.