Wikipedia is a great source of information.

Spell Check

By having Wikipedia spell check edit's on the web page, bandwidth and minor edits can be saved. The spell checker could be similar to gmail's.

User Ranking System

A ranking system that gives users a ranking based on many different factors

-the amount of articles edited
-the amount of text added (with documentation a +)
  -the amount of there text currently still on the article page
-the genre's of articles edited

This ranking can then be displayed on there user page and shown to everyone. The exact algorithm will be unknown, so they people don't hack it and get a higher score then they should.