Birdhouse is not a Twitter client, but an additional application to help organize your thoughts. They have a good list of feature ideas:
- # Quickly jot down your ideas, just like in Notes.
- # Count down to 140 characters, just like in Twitter.
- # Save as many as you want, revisit them later.
- # Capture your ideas offline, even in Airplane mode.
- # Rate drafts with stars and sort by best or by newest.
- # Manage and publish from multiple Twitter accounts.
- # Unpublish the bad ones just as easily.
- # Back everything up through email.
You also download this from the iTunes application store in case you didn’t know 
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