On the test wiki I set up recently I got some input in what is missing for a wiki in drupal. Some of the points I addressed with three custom modules.
In the meantime, these modules have matured into two official modules: recent changes and wikitools.
The first one helps you keeping track of the changes on your site by providing a Mediawiki like recent changes page as well as an rss feed. This module integrates nicely with the diff module by providing links to the diff-view as well as incorporating the diff in the rss feed.
The second one is an assortment of smaller things which don't really need an own module. The best way to see what it does is by taking a look at the features list on the project page or by looking at the demo. It integrates nicely with the freelinking filter so if you use freelinking alredy, just give it a try and if you don't like it you can disable the module and you will be back to normal.
The how to on my page now reflects the new modules.
And if you look again at the list of missing features you will see that there are no show-stoppers left.

Comments
great additions
Thanks for this, these are great additions to bringing better wiki functionality to Drupal. Looking forward to testing them out.
Chris
ALIAN DESIGN
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Gravitek Labs