I think the following arrangement between authors would be simplest to implement:
Whenever one author takes up editing, he should write the following details in the TODO tab:
1. His own name
2. How he intends to change the page
3. By which date he intends to finish the editing
Example (for the "What is LibreOffice?" page):
-----------------------------------------------------------------------------------------------------
Name      Change                                                      Estimated finish date
-----------------------------------------------------------------------------------------------------
David      Adding "product philosophy" text                   1st Feb 2011 (Done)
Narayan  Adding "Unique features in LibreOffice"          20th Feb 2011   
-----------------------------------------------------------------------------------------------------
Once the task is over, add  "(Done)", so that the next author knows the page is freed up.
As a practice, all authors should check this page out before touching the contents page.
                                          
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