Change the boot image on Mac OS X 10.4 and later (on Apple hardware).
Here's how to change the boot order on your PC view it
Just like Windows, Ubuntu also has a selective boot menu view it
Safe Mode lets you diagnose and solve computer problems view it
Here's how you can speed up the time it takes to boot up in Windows 7! view it
You have control over which applications start up when you boot Ubuntu view it
How to make sure you're booting from CD or DVD view it