The TechNet wiki shows two RSS feeds:
There is also a feed for a tag in the the tag cloud:
I use Outlook 2010 to feed each of these into a folder. I then write filter rules on the folders to show me stuff that has keywords I am interested in tracking.
However, you can hack the articles feed to show you a specific tag, like this:
Which gets you your custom-feed: http://social.technet.microsoft.com/wiki/search/Searchrss.aspx?wikis=5&tags=WS08&orTags=0
If you want to make your own categorization/table of contents/custom navigation scheme through the wiki, just start a new tag, tag the articles you want with that tag, and then subscribe to the custom tag feed.