Hey:
There have been some
issues with laptop locks.
Anyhow, are you worried about the thief getting your data? If so, the drivelock will help out, but I would also recommend some sort of encrypting file system or tools (eg. PGP Disk).
The BIOS password is helpful but can be circumvented. The Windows admin password does nothing to help with security when someone has physical access to your system.
IMO, drivelock does the most to safeguard the data. However, if the person just wants the hardware, you are out of luck. But, I think you are adequately protected from a petty thief.