Twitter has unveiled a new Follow button that it makes it easier for visitors to find and follow new Twitter accounts without leaving a website or having to visit Twitter.com.
 sites have added the Follow Button today, making it easy for you to discover the Twitter accounts of your favorite reporters, athletes, celebrities, and other personalities. Using the Follow Button is as simple as a single click. You can also see the profile and latest Tweets of the account you want to follow by clicking the username next to the Button.
You can customize your own account at twitter.com/followbutton.
ClickZ offers more coverage here.