I get a 404 error when trying to link to CCS Pages from my CCS FeedBurner page. This seems to be a problem with Google FeedBurner. Some page links are correctly redirected with feedproxy by FeddBurner and some are not. Since FeedBurner is a new property for Google at this point, we suspect this problem will go away over time.
The work around is to use the View XML link in the box at the top right. Those links will correctly link to CCS.