Because I didn't realize there was something really cool about this! I finally just happened upon it accidentally. One one of the times I rebooted, I noticed the pretty little icons for cds, thumb drives and more below the toshiba logo at startup. Pressing the left and right arrow keys highlighted the icons and voila I was able to boot from my selected device - CD.

Yah , I know - RTFM. I don't happen to have it. But now that I knew what I was looking for, I was easily able to find it online.

From the manual,

"You can also manually choose the boot-up sequence by sliding the power switch, then quickly pressing the right or left arrow keys."

Very cool feature!