As you may remember, I've been using the RSS Reader Panel Extension to Firefox to read RSS feeds. Unfortunately, it had a few problems with sites using the atom protocal, including most Blogger sites.
Fortunately, the source code for the RSS Reader Panel is available. Someone with more Javascript experience than me found the problem and fixed it. Details are available at the Reader Panel Message Board. (See message 546.) So far, the fixed version works great. Hope the fix makes it into the next official version.