Data security on Macbook Pro 13.3 2.26gHtz

Hi Experts,
I made the recent switch from Windozzz to Macbook Pro and I am loving it every bit although I am totally new to the OS. I have some basic questions.
1. How do we secure our data in Mac. I the sense, lets say i have 100 images and some files. There is something called as encription under Security. I enabled that, set a master password. My question is that lets say for some reason, I have to take the laptop to the service center and leave it there, will they be able to view all my personal files? Is there a way to secure our data so that the service people cannot view them? Or is that functionality not available on Mac OS.
2. I noticed a significant difference in colors if I use the color RGB. The web images look fine if I use sRGB. IS that the common practice for other users as well? The colorRGB looks too yellow and grainy.
thanks in advance!
Cheers,
Sunil

Create an encrypted disk image, and store your secure files there. Those are encrypted with 256-bit AES (theoretically unbreakable, at least for now).
http://support.apple.com/kb/HT1578
(Note - be sure to UNcheck the box to store the password in the keychain, and then never forget that password, or the data are gone).
For the internal display, you should use the Color LCD display profile (the only one that shows up if you check the box to 'Show profiles for this display only'. Using a 'canned' profile for another type of monitor will generally not give good results. Alternatively, click the Calibrate button and customize your calibration.

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