The just released limera1n promises to jailbreak iOS 4.0-4.1 on iPhone 4, iPhone 3GS, iPad, iPod Touch 4G, and iPod Touch 3G. It's Windows only for now, with Mac & Linux support coming soon.

Mere hours after iOS 4.1 became available, an iPhone Dev-Team user Pod2g found a bootrom exploit, meaning that the new update is indeed jailbreakable. However, this one differs—and could cause Apple a lot of pain.

Now you can put your iPhone into field test mode, which will allow to easily and precisely test your cell signal reception quality. You just need to follow these two easy steps:

The iPhone 4's best new feature in iOS 4.1—besides not hanging up on people with your face—is its ability to capture HDR photos. But you've gotta use it correctly.

Apple's new Game Center page lists the iOS devices that will let you get involved in this whole playing games with other people thing that's happening soon. Second-generation iPod Touch owners: you're in luck! iPhone 3G owners: you're not!

If you go over to Apple's UK site, you're sure of a big surprise: they're listing the iOS 4.1 software update as being released September 8th. The US site still says "coming soon." [Apple UK]

Twitter is currently in the final stages of testing push notifications in its iPhone app, pending a full activation of the feature in the next iOS release. According to TechCrunch, users with iOS 4.1 and its updated Twitter client will be able to enable the feature, bringing them closer still to the dream of full…

The most surprising nugget Apple's including in iOS 4.1 is the ability to take HDR photos. You've seen plenty of these before—photographs with vibrant, unreal colors—but what are they exactly?