Apple's unloading iOS4 (that's the new name for iPhone OS, in case you didn't know) tomorrow, which means you should get started tonight.

A Gold Master release of iOS 4 (née iPhone OS) was seeded to developers yesterday. And the next iPhone's software has been surprisingly accommodating to jailbreakers' attempts to crack it wide open.

The Apple iOS 4.0 Gold Master has hit the iPhone Developer Center and we're tearing it apart to find out what's new so that you don't have to risk your iPhones. Here's what we've discovered so far.

The Apple iOS 4.0 (formerly referred to as iPhone OS 4.0) has gone gold master and is available to iPhone developers now. We'll do our usual rundown of what's new soon, so keep an eye out. [Apple]

It's about time that the iPhone gets a custom dictionary, and according to this screen from the latest iPhone OS 4 beta, you'll find one under keyboard settings. Duck yes! (Discover more recent iPhone OS 4 findings here.)

Oh yes! iPhone OS 4.0 Beta 4 is out and we're tearing it apart to find out what's new so that you don't have to risk your iPhones. Here's what we've discovered so far. Updated.

Given surging popular sentiment-that-will-not-amount-to-anything, this might make you feel ickier, rather than happier, but the rumor is that deep Facebook integration with the iPhone is actually happening.

Attention, developers! Apple's got the third beta of iPhone OS 4.0 and its SDK available for download here. No word yet on what's changed from the previous release, but if you're registered with the iPhone Dev Center, get to it. If you're one of the rest of us, the official public release is expected this summer.…

Multitasking! On phones! Everybody does it now. But each smartphone platform does it differently. Here are the various tricky ways that the major platforms try to juggle multiple apps.