Pinkbot is a WinterBoard theme (we know, bleh) that allows you to alter Tweetbot with various pink UI elements.
If the Pink Panther ever decided to use an iPhone, this would be his Twitter client of choice...
Following the release of the new Tweetbot version 2.0 earlier today, the Tweetbot team has just released Tweetbot for iPad, now available on the iTunes App Store. The new iPad version includes many of Tweetbot for iPhone's new features, and also features new iPad specific gestures.
Tweetbot for iPad sports the following features: