Ok, so we're kind of cheating with this one; you probably already know about Twitterrific, if you don't actually have it installed on your iPhone. But we're using our daily app spotlight today to point out that the folks at Iconfactory have released version 3.0 of the popular Twitter client. Along with making the app universal (which means it now works on both iPhone and iPad), they've updated the interface and code for iOS 4. That means that it's not only purdier, but it's faster and works with in-app switching as well. Twitterrific is a free app, with a US$4.99 in-app purchase to remove the ads and manage more Twitter accounts.
That's not enough? Alright, we'll throw in a few more upgrades. Smule's popular I Am T-Pain app has also upgraded for iOS 4, making it not only ready for the Retina Display but also adding the ability to share auto-tuned videos on a few popular social networks. That one's on sale for only 99 cents right now, too.
Finally, ngmoco has released Eliminate: GunRange, an iOS 4-specific app that makes use of both the gyroscope and the premium Retina Display in the new iPhone. It's just 99 cents, too. While it's just a shooting gallery, it'll be a nice demonstration of the new hardware's capabilities if you're into the firearm range thing. So, there you go -- three brand new apps to fire up on your new iPhone 4.