AIOS & Sage Rated 4 out of 5 stars
Using Sage, in combination with "All-In-One-Sidebar" is an extremely useful way to keep up-to-date with RSS feeds. The combination is very powerful and yet is frugal in its use of desktop real estate.
It would be nice to have an auto-update feature, but the update is just one click away.
A significant advantage of Sage is its lack of verbosity as compared with the big guys like Google Reader.
Using Sage and AIOS, any of my RSS feeds are readily viewable in Firefox Tabs, and I can be very selective about what I want to read at any given time. I don't have to scroll down through irrelevant and long entries.