Today Only (October 26, 2009), NirbiruTech LTD. has TwitBird Pro (iTunes Link) in the iTunes App Store for FREE.

TwitBird Pro is a fast, flexible, rich featured twitter client for iPhone and iPod touch.It has a lot of cool features that you see in other twitter apps but rarely together. It offers everything you’d expect for a good twitter client, from your timeline to search. It is such a powerful twitter client with simple user interface, people will find no difficulties to use all the features.