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I found that I use Safari much more on my Mac since Safari 4 was released.

By default, to jump to the Google Search field in Safari, one must press Option-Command-F. This isn’t the easiest one-handed key combo in my opinion. The key combo to jump to Google Search field in Firefox is Command-K, a much easier key combo.

How does one pull off Command-K in Safari:
1) Choose Apple menu > System Preferences, and then click Keyboard & Mouse.
2) Click Keyboard Shortcuts, and then click the Add (+) button.
3) Choose an application from the Application pop-up menu. In this case, you’ll choose Safari.
4) Type the menu command for which you want to set a keyboard shortcut in the Menu Title field.

You must type the command exactly as it appears in the application menu, including ellipses and any other punctuation. An ellipsis is a special character that looks like three periods. To type an ellipsis, press Option-semicolon.

So, you would type Google Search Option-semicolon (leave the space out between “Search” and pressing Option-semicolon) yielding “Google Search…”
5) Click in the Keyboard Shortcut field and press the key combination that you want to assign to the menu command, and then click Add.

Here you will press Command-K and click Add.

This makes using Safari on Mac OS much easier especially since Apple added Control-Tab/Shift-Control-Tab when Safari 4 hit Macs and PCs.

Some info taken from Creating keyboard shortcuts for applications for reference.