My reaction to the comment below this article:
First of all, when you visit fuxoft.stumbleupon.com, by default, you only see the links I commented on, not all the links I rated "Thumbs up"! To see those, select "Pages I like" from the drop-down menu on that page or use this RSS feed.
Secondly, take a look at "My starred items" box at the right of this page (under "previous posts"). This is a feed from my Google Reader that has more items in it than my StumblUpon page (of course, this is also available as RSS).
However, neither StumbleUpon nor Google Reader quite satisfy my needs in their current implementation so there might be some changes in the near future...