There is a wiki how-to to topic on tools you can combine to help you stay on top of wiki content of interest: http://social.technet.microsoft.com/wiki/contents/articles/wiki-how-to-monitor-content.aspx.

To example, you can “subscribe” to a wiki topic using email, and when the topic is changed you get an email that looks like this:

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Now there is an RSS feed for each page on the wiki:

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if you subscribe to the RSS feed, the item that comes to you on update also shows the stuff that got changed in either red or green so you can see right away what changed…

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Handy.