Google Reader added some nifty features just now, which are very welcome to those who still read RSS feeds, as I do, occasionally. It's a bit 2007, I know. First, each item now has a "Send to" option, to easily link to a post on various social networks, e.g. facebook and twitter. I tested the feature with twitter in the latest Chromium alpha and Safari 4, but it does not seem to work. On Chromium (a very alpha product) nothing appears to happen, in Safari it complains about a popup being blocked.
Another nice feature is the ability to automatically mark all items older than a certain amount of time as read. If you're still reading RSS (or Atom for that matter) feeds, give it a whirl.