Since I have my Apple computer, I needed to learn some basics like new shortcuts :

• Command-Shift-3: Take a screenshot of the screen, and save it as a file on the desktop
• Command-Shift-4, then select an area: Take a screenshot of an area and save it as a file on the desktop
• Command-Shift-4, then space, then click a window: Take a screenshot of a window and save it as a file on the desktop
• Command-Control-Shift-3: Take a screenshot of the screen, and save it to the clipboard
• Command-Control-Shift-4, then select an area: Take a screenshot of an area and save it to the clipboard
• Command-Control-Shift-4, then space, then click a window: Take a screenshot of a window and save it to the clipboard

In Leopard, the following keys can be held down while selecting an area (via Command-Shift-4 or Command-Control-Shift-4):

• Space, to lock the size of the selected region and instead move it when the mouse moves
• Shift, to resize only one edge of the selected region
• Option, to resize the selected region with its center as the anchor point

To burn an ISO file :

1. Insert a blank disc.
2. Start Disk Utility.
3. From the File menu, choose Open Disk Image and select the ISO to be burned.
4. In the list of volumes, you will now see an item representing the ISO file. Select it.
5. Click the Burn button and follow the instructions.

Very good and useful tool : http://www.titanium.free.fr/pgs2/french/onyx_snowleopard.html website is in french but the software in English.

Here’s a list of system start-up hot keys to press while Mac OS X is booting, and their various effects:

C – Boot from a CD/DVD
T – Boot in Target Disk mode (FireWire only)
N – Boot from an attached network server (NetBoot mode)
X – Attempt to force Mac OS X to boot
Shift – Boot up in ‘Safe Mode’ which has limited functionality
Command+V – Boot into Verbose mode
Command+S – Boot in Single user mode