Google reader
Google just released Google Reader, a web-based RSS reader. Just like gmail, google reader is using AJAX technology.
For those who already use another RSS reader, Google reader allows you to import your subscribtion via the OPML file. I exported my subscribtions from NetNewsWire and imported them into Google Reader. It took quite a while to import my 166 subscribtions. Just like gmail, my subscribtion groups became label.
Interested to know more about Google Reader? Read the Google Reader Review from Unofficial Google Blog or just go ahead and try it!