Ever want to know which iMacs use the Intel Core i5 processor? Or which Mac models lack FireWire? EveryMac has created a very neat Web-based tool that lets you select from a wide variety of system specifications and see which Mac models match. It’s in beta, so if you see any errors or have suggestions for improvements, drop them a line. follow link
Keyboard-based Dock Navigation
If you're a fan of keyboard shortcuts and navigation, you may want try accessing the Dock from your keyboard. Press Control-F3 to enter the Dock's keyboard access mode. Then you can press a letter corresponding with an item's name to select it; press Return to open it, Command-Q to quit the selected application, or Escape to exit keyboard access mode. You can also use the arrow keys, Tab key, and other keyboard navigation keys to toggle between the Dock items.
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EveryMac’s Ultimate Mac Sort Tool