Recently, I’ve been running across weblogs without an obvious link to their RSS feed. A quick look at the page source shows the requisite RSS auto-discovery links, so I can only assume that there is a standard template that makes it easy to omit the explicit link. Now, without naming names [cough TypePad cough], might I suggest that all weblogs with an RSS feed should contain an obvious feed link.
If you think that Aunt Tillie will be confused by all those angle brackets, then have the feed link go to a page explaining how RSS aggregation works. Those already in the know can quickly see the link and let their aggregators auto-discover the true feed. And those who click through will get a nice explanation. For extra credit, transform the true RSS feed into something that might appear in a single page aggregator.