I've been using
Sage for a while to keep track of XML and Atom feeds for my favourite blogs and other regularly updated sites, it's been very good and transformed the way I "surf".
A few weeks back all of my feeds disappeared from the list and I couldn't add any new ones. I uninstalled it and re-installed it and did the same with Firefox but I still have the same problem, I've now run out of enthusiasm for fixing the problem and have moved on.
Now I'm using
Feedreader and it's also really good, I'm not using many of it's features yet but it's already fitted in well with my needs as well as my low ish threshold for "fiddling about with stuff to get it working".
One thing I have learnt today is that Blogspot blogs (like this one) automatically have an Atom feed, add a /atom.xml after the URL and there you are... Why didn't I know about this before?