Today, Apple rolled out firmware upgrade 1.1.4 for the iPhone and iPod touch. Still no sign of a software development kit (SDK) to allow developers to create official native applications for the iPhone, however.

As with previous updates, most users will want to download and install 1.1.4 through iTunes. To do this, simply plug your iPhone in and hit Update or Restore. As with all major software upgrades, back everything on your iPhone or iPod touch by performing a full sync to your PC or Mac before moving forward.

Though the 1.1.4 file itself is rather large, at 162MB, early reports indicate it is more about fixing bugs than bringing anything new to the table. While Apple hasn't said what these bug fixes are, some who've installed update report 1.1.4 fixing some SMS, Bluetooth, and e-mail errors that were introduced with the previous firmware upgrade, 1.1.3.

There's also good news for folks who've jailbroken their iPhones to run native applications using ZiPhone or a ZiPhone related jailbreak under 1.1.3. Apparently, the jailbreaks work even after the installation of 1.1.4, allowing you to continue to use third-party software.

This is very different from previous firmware upgrades, all of which disabled the ability to run unofficial software on the iPhone.

Folks who've unlocked their iPhones to work on networks other than those of Apple's official carrier partners aren't as lucky with 1.1.4, however. Unlocked 1.1.3 iPhones do not – apparently - automatically become unlocked 1.1.4 iPhones.

So while it is always recommended that those who've jailbroken their iPhones wait until developers have had time to fully go over a firmware update before upgrading, this time around it is those who've unlocked their iPhone who should be the most careful about proceeding. In other words, wait until hackers have cracked firmware update 1.1.4.