Just food for thought. Ok... let's say you have a BIOS password set, a Grub password set, and a log-in password you have to enter. That's three passwords you have to deal with every time you boot. Now, you aren't laboring under the mis-impression that any one or more of these passwords is enhancing your laptop securiety, are you?
There is no such thing as a laptop being secure from a would-be intruder that has physical access, except with good quality cryptography. If I wanted to get at your data on your laptop and had physical access to your machine I wouldn't bother with your password protection anyway.