There are three elements to Anywhere: follow buttons, tweet boxes and user logins. There are also some simple ways to bring the interactivity of twitter.com into your site, such as automatically linking usernames and activating hover boxes to get additional information about a user. Twitter has provided great example code. Read on for an overview of each portion.
If you want to encourage your visitors to follow you without sending them away from your site, simply embed a follow button on the page. This drops the barrier to a follow, letting the user decide at the moment of interest.
This is a small way to put Twitter on your site. Anywhere can go further.
If you want visitors to interact with you on Twitter or tweet about your service, plop a tweet box on the page. You can even pre-populate the box with a message and change the "What's happening" to something else, like a question you want answered.
The farthest-reaching feature of Anywhere is the user login and signup called Connect With Twitter, which Twitter says "allows for deeper integrations than would be possible without user authorization."
Twitter's announcement post lists a number of launch partners:
The full list of sites who have been working on @anywhere implementations pre-public launch include AdAge, Amazon, Bing, Citysearch, Digg, Disqus, eBay, Foursquare, Gawker, Google, Gowalla, The Guardian, The Huffington Post, Hunch, Mashable, Meebo, MSNBC.com, The New York Times, Salesforce.com, WSJ.com, Yahoo!, and YouTube.
However, it's still difficult to find these implementations in the wild. Perhaps they will roll out over the next few days. In the meantime, what do you think of Anywhere? And what, if anything, will you build with it?