Hmm, I'm using Safari on Mac OS X 10.6, and your link gets automagically translated to my link. Curiouser and curiouser... on this page:
http://leaflabs.com/feeds/
There is a 'Blog Feed' link which points to:
http://www.leaflabs.net/blog/feed/
Note the .net, not the .com. Following that leads to a couple permanent redirects:
http://www.leaflabs.com/blog/feed/
and then:
http://leaflabs.com/blog/feed/
which is what you said. So nothing wrong in all that, I guess, and when I wget that link I get something that looks on casual inspection to be RSS. I just have to figure out why Safari turns that last URL into a 'feed:' URL (which may or may not be a problem) and why it renders nothing at all (which is kinda not good). If I come up with any answers, I'll be sure to post.
Thanks,
- Bruce