Here's a nifty little Firefox add-on, which I discovered via MakeUseOf. It's called gReactions.
The extension adds a button underneath every item in Google Reader that says "Show Comments." Click on it and instantly you can browse incoming links from Twitter, Friendfeed, Digg and more. In addition, for some blogs, you can view comments right in Google Reader using gReactions. Neat tool. (Disclosure: Pizza Hut, which is mentioned in the screen shot, is a client of Zeno Group, a Daniel J. Edelman company - where I work)
