• Step1: Open folder with custom sounds
  Navigate to the “~/Library/Sounds” folder in “Finder” Command+Shift+G. The “~/Library/Sounds” folder contains all the custom sound files used on your operating system.
• Step 2: Copy the sound clip in AIFF format
  Copy the sound clip you want to add to the alerts from the location you have it on your computer and drag it into the “~/Library/Sounds”. (Note: The sound clip must be in AIFF format. Convert it to AIFF using iTunes – see next step how to convert to AIFF).
• Step3: Convert a the sound clip to AIFF format via iTunes
  3.1. Launch iTunes and click the “Preferences” menu.
  3.2. Click “General” and click “Import Settings”.
  3.3. Choose “AIFF Encoder” in the “Import using” menu and click “Custom” in the “Settings” menu.
  
  3.4. Select “48.000 kHz” sample rate and a 16-Bit sample size. Select “Stereo” under “Channels” and click “OK.” Click “OK” again.
  3.5. After importing it, click the sound clip and click “Advanced.” Click “Convert Selection to AIFF” to convert the sound clip to AIFF audio format.
  
  3.6. When the conversion completes, drag the newly created AIFF audio clip to the “~/Library/Sounds” folder (see the Step 1).
• Step 4: Done.
  Open “System Preferences” by clicking the “Apple” log on the top left corner on your screen and click “System Preferences”. Click “Sounds” and click “Sound Effects.” You should see the AIFF file you uploaded together with other sound clips in the “~/Library/Sounds” folder.

Also, make sure the “Play user interface sound effects” is checked in System Preferences > Sound > Sound Effects.

P.S. Now we have to get this file to show up in the Alerts list in System Preferences, Mail and iCal, etc.

Custom Alert Sounds in Mac OS X Leopard is a post from: My MacOS X

In Snow Leopard you can now use the Tab key in any combination with the Shift, Control, Command, and Option keys. For example, you could change the Exposé All Windows activation keystroke to Option-Tab, which might make sense if you’re used to using Command-Tab to switch applications and want to have a similarly-assigned shortcut for Exposé.

• Open the Keyboard Shortcuts tab of the Keyboard System Preferences panel
• Select the Exposé & Spaces entry in the left-hand column
• Click on the All Windows entry below Exposé in the right-hand column.
• Double-click on the right-hand side of that entry
• And just press Option-Tab

and you’re done.

You can now use the Tab key in your user-defined shortcuts, which opens up a number of additional keyboard combinations.

Use Tab key in Snow Leopard keyboard shortcuts is a post from: My MacOS X

Quickly way to change Input Sound Source is a post from: My MacOS X

Hidden features in Snow Leopard from MacWorld is a post from: My MacOS X

• Open the Dock System Preferences panel,
• Check the Minimize windows into application icon option.

Once you do that, minimized windows will disappear into their source application’s Dock icon.

Snow Leopard Dock

Minimize windows into Dock icons is a post from: My MacOS X

• Go to System Preferences
• Select “Date and Time”.
• Select the “Set time zone automatically by location” option.

This works using CoreLocation, just like the iPhone. Even though it’s just an option. Once you do this, your time zone will change as you travel.

Date & Time Panel

Automatically change time zone by location in Snow Leopard is a post from: My MacOS X