So I was installing Windows Vista on a 15" Macbook Pro using Bootcamp. Everything was proceeding along smoothly. I partitioned 45 Gb for the Windows Partition, I inserted the Vista CD#1, and the installation process proceeded. I was prompted to insert Vista CD#2, but couldn’t figure out how to get CD#1 out because the “Eject” CD/DVD button was unresponsive.

Answer:
Power down the MBP, then power it back up while pressing & holding the trackpad button. The MBP will spit out the CD/DVD.

Ps
I had to use a DVD version of Vista to sucessfully install the operating system. Works great! The MBP scored a 4.5 running Windows Vista.