I've installed and activated version 1.2 at my WordPress 3.0.1 blog. As far as I can tell it's not working.
My blog has 14 posts and 3 pages, all published. When I check the feed, both through FeedBurner and the native WordPress Theme, I only see the posts. For example, I should see an About page in the feed.
Within WordPress, I set the feed to show a large number of posts. I also re-checked the feeds after 30 minutes in case they needed a chance to refresh for some reason, but I don't see the three pages.
I'd love to use this plugin if I can get it working.