The thing that is often lost in the discussion about the API and innovating is the fact that third party clients innovated significantly in the UI and UX of Twitter. In some cases Twitter's own clients lag behind considerably. Things like @ completion, hashtag completion come to mind as features added in third party clients.
I would hate to see the mobile Twitter UX stagnate as we have to wait for Twitter official clients to implement all the great ideas around improving UI and UX. Another issue is that of platforms. Third party developers are the first ones to reach any new platform with an app. Do we really need to wait for Twitter to decide a platform is big enough to be worth their time? Because this notion that reproducing the mainstream client experience is something only Twitter can do is at odds with that notion. -- Twitter developer documentation and resources: http://dev.twitter.com/doc API updates via Twitter: http://twitter.com/twitterapi Issues/Enhancements Tracker: http://code.google.com/p/twitter-api/issues/list Change your membership to this group: http://groups.google.com/group/twitter-development-talk