Plume is a feature-rich Twitter client. Available free with ads or $4.99 without.
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Pro In-app browser
Plume has a built-in browser so you can view linked content without having to leave the application.
Pro Mute functions
Hides a persons tweets from timeline without unfollowing them. Can also mute words and applications.
Allows color-coded lists and users.
Pro Multiple account support
Allows easy switching of accounts withing the app.
Pro Real-time notifications
At the expense of more battery consumption you can tell Plume to "livestream" updates so you get notifications of events as they happen.
Pro Photo & video previews in timeline
Embeds photo and video previews in timeline.
Pro Multiple picture host support
You can upload your picture to a selection of hosts. Among them Twitpic, Plixi, Posterous, and MyPict.me.
Pro In-line image viewer
Embeds images in timeline.
Pro Tablet support
Same application works on phones and tablets.
Con Intrusive ads
You can also pay $4.99 for Plume Premium that removes the ads.