Paul Menard

Provide Versioning, Preview and Rollback ability on Pages and Posts.
<a href="http://www.codehooligans.com/2008/04/18/versioning-your-blog-content/" title="Versioning Your Blog Content" rel="nofollow ugc">Plugin Homepage</a>
<h3>Version Histroy</h3>

1.0 – 2008-03-16: Initial release 
1.1 – 2008-03-21: Fixed slight error in INSERT SQL for the new Revision. Also fixed escape on inserted content. 
1.1b- 2008-04-04: Changed the ‘post_status’ value on the saved revision to ‘inherit’ as this was causing problems with some other plugins. 
1.1c- 2008-04-17: Added notation to indication current version. 
1.2 – 2008-04-18: Changes to Admin display section to make things work under WP 2.5 
1.8 – 2008-05-04: changes to enhance WP 2.5 design integration. Added ability to delete revisions, set a no revision ‘minor-edit’ option, set a no revisions for life checkbox. Display on last 5 revisions with link to reveal more. 
1.8.3 – 2008-05-23: Minor changes to display. Added link to reload most current version of content.

Revisions

Provide Versioning, Preview and Rollback ability on Pages and Posts.

Ethan Allen

UserDocs lets you create a section of your site dedicated to product documentation. Create anything from software documentation, to how-to’s, to product specs, the possibilities are endless. Spend less time answering support requests, get UserDocs!
Besides a good feature rich product and amazing support; Product Documentation also plays an important role in terms of customer satisfaction and revenue. If there is no documentation available on the product site,\ customers will be forced to submit a support ticket costing your team valuable time.
Self help guides allow customers to go through frequently asked questions and general queries and help them resolve small issues on their own. Good documentation contains easy navigation and a clean layout with better readability. Step by step explanation with screenshots helps too. UserDocs has you covered.

UserDocs

A simple user documentation plugin for WordPress.

Revisions vs UserDocs