Twitter has tweaked their sidebar to now refer to Replies as “Mentions,” and adjusted the functionality so that rather than showing only those tweets that begin with your username, they’ll show all tweets that mention it.
While this functionality could already easily be accomplished using Twitter search, or through a client like TweetDeck, it now allows all users of the Web interface – still the most popular method for updating and tracking Twitter – to see everyone who mentions their username.
Twitter’s Biz Stone further explains the move in a blog post: “In your Twitter sidebar you’ll now see your own @username tab. When you click that tab, you’ll see a list of all tweets referencing your account with the @username convention anywhere in the tweet—instead of only at the beginning which is how it used to work. So for me it would be all mentions of @biz. For developers, this update will also be included in the APIs.”
This also means you should also start see all retweets you generate, since those always start with something along the lines of “RT @adamostrow”
What sidebar? Is there a Twitter sidebar with the regular web interface? I looked and looked at the little tiny letters at the bottom of my Twitter "Home" to see if I missed something...but alas, no sidebar that I could see. If there really is one, I'd love to know, although I'd be worried about incipient Alzheimer's, having missed such a thing for so long!