Twitter client Tweetie 2 has been announced as coming soon - first for iPhone, then for Mac.

With an offline mode, the new iPhone version will get a drafts manager, Twitter contacts can be linked to contacts in the iPhone address book and it will offer threaded conversations too.

Other new features will include full landscape support, a redesigned compose screen and the ability to save searches.

Tweetie 2 for Mac will be a completely free upgrade but Tweetie 2 for iPhone will be "a whole new app" for OS 3.0 devices.

Following the necessary App Store approval it will be available to download for $2.99.