Finally! Twitter for iPhone has arrived with iOS4 support. Why is that important? It finally means multitasking can be accomplished with Twitter while running other applications at the same time. The program also debuts Retina display capabilities.

The new release is a much awaited addition which now allows Tweets to be received while the Twitter application runs in the background of the iPhone, an option that was not available on older iPhone operating systems which did not feature multi-tasking capabilities.

The new Twitter application also fixes the annoying “stuck top tweets” bug, promises a more secure Twitter build and brings photo and video posting thanks to Oauth support which has been fully integrated into the application.

Reading this post from your iPhone 4? Click here to download the upgraded version of the Twitter application (formerly known as Tweetie).