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This might be useful for you: hit "Command Option 8" on your keyboard, then hit "Command Option =" to zoom in (repeat to keep zooming), and "Command Option -" to zoom out. When you want to go back to normal, full-screen mode, hit "Command Option 8" one more time.

This behavior is built into OS X (you can find it under System Preferences > Universal Access > Seeing). It's fast and works in all applications.