I subscribed to several RSS feeds I usually read in Sage firefox extension. There are about 25 feeds (BTW: the only feed which does not work is a Zimbra blog, but I've read, that you know about this problem. Would be nice to fix though).
Anyways, is there a way to check all of them at once? The whole idea of RSS feeds is to know when there's something new on a site. Going to each RSS folder and clicking a button to retrieve new version is not a good way of doing it. I have nothing against clicking a button to check RSS feeds.
Maybe another good way would be to change the behaviour of Get mail button to check all subfolders too. So I could have "RSS feeds" folder with subfolders for each feed. When I click on RSS feeds folder and click Get mail, I would check all the feeds.