Mac OS X doesn't offer much scope for customising the Dock beyond changing its size, position and what happens when you move a mouse over an icon, but there is a hack to change the 3D Dock into 2D - the same style that's used if you reposition it to appear on the left or right of the Desktop.
Open a Terminal window and type:
Press Return, then type:
The Dock will close and re-open with a flat, translucent style that lacks the usual reflection. You can revert back to the original style typing:
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Open a Terminal window and type:
defaults write com.apple.dock no-glass -boolean TRUE
Press Return, then type:
killall Dock
The Dock will close and re-open with a flat, translucent style that lacks the usual reflection. You can revert back to the original style typing:
defaults write com.apple.dock no-glass -boolean FALSE
