With hits to the social networking site apparently flat-lining the developers at Twitter are keeping busy with secret additions to their new List feature.
Scouring the code this author has discovered that Twitter has plans to allow its users to directly add “people, businesses or brands” to their lists via a search box on their own home page. Using the feature brings the user to Twitters standard people search page.
If you have the WebDeveloper Toolbar addon for Firefox you can see this hidden feature using the Show Hidden Elements option under Miscellaneous.
There is no indication when the feature will go live but with Twitter progressively launching their other new feature, Project ReTweet, it should be live in the near future.