Browsing to
www.apple.com/startpage/ and doing a view source will reveal a nice link.
<link rel="alternate" type="application/rss+xml" title="RSS" href="link_to_your_rss_feed" />
I could criticize this approach, but I won't. I'm sure there is some technical reason for doing it this way. It would be more time consuming to actually discover RSS feeds by looking at every link on a page to see if it points to an .rss file... but then again you could have a thread specifically to do that on a page load... Then again, this could just be a preliminary hack that will be changed once the official release is available.
Update: Aaron Adams beat me to the punch. 
How to Get Safari RSS (the upcoming release of Safari) to see your RSS feed.
