HideBars can hide the default blizzard bars; shapeshift, warrior stance, stealth, shadowform, etc. For example a warrior has battle/defense/berserk, rogue has stealth, druid has shapeshifting, and priest has shadowform. The icons could rather be moved anyway from the spell book manually to the action bars to take advantage of keybinds and other features. Or a player in the forums mentioned to use keybinds for special action button 1-10 -- thanks miu

Command:
* /hidebars

Options:
* /hidebars off (disable and show bars temporarily)
* /hidebars on (enable) (default setting)

Install:
* Move the files to the game folder,
.\World of Warcraft\Interface\AddOns\HideBars\*.*

Uninstall:
* Delete the folder in the game folder,
.\World of Warcraft\Interface\AddOns\HideBars

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Bugs:
* Checking for protection errors broken by patch 2.3. For now, manually turn addon off/on after protection errors cause it to behave incorrectly.
* Sometimes bars are visible when in combat because not hidden fast enough by the blizzard UI and too late now that combat started.

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ChangeLog:

Revision 3.1.0 (Apr 19, 09)
* Updated TOC file for patch 3.1.0

Revision 3.0 (Oct 23, 08)
* Updated TOC file for patch 3.0

Revision 1.14 (Nov 21, 07)
* Updated TOC file for patch 2.3.0
* Removing error checking for protection errors. Broken by patch 2.3. For now, manually turn addon off/on after protection errors cause it to behave incorrectly (thx JeHicks)

Revision 1.13
* Updated TOC file for patch 2.1.0

Revision 1.12
* Keep addon working after protection errors usually caused by combat. (thx JeHicks)
* Turning addon off/on keeps addon working after protection errors too just in case (thx JeHicks)

Revision 1.11
* Updated toc file.

Revision 1.1
* BC 2.0 compatible. Updated toc file.
* Adjusted actionbar frames since can only use out of combat, because of patch.
* (web site erased all my previous changelog info :()