Not surprisingly, I switched to Google Reader as the tool to read blog feeds. I used to use the Sage plugin for firefox. The features of Sage are enough for my requirements. However, it is difficult to synchronize my readings (both subscriptions and reading progress) on various machines. From time to time, I need to remotely connect to the machine at office to synchronize. Google Reader is the solution if you need to read feeds from different machines. To switch from Sage to Google Reader is very easy, just export the OPML file from sage and import it in Google Reader. And then you can start to enjoy the new reader.