This one's definitely not for the casual iPhone unlocker, but if for some reason you're looking to toy around with a couple of different firmware versions at a time, you can now apparently set up a dual-boot system of sorts on the phone. As Jonathan "NerveGas" Zdziarski notes in his how-to, the hack in question has actually been in use by the iPhone Dev Team for "several months" now, but he says that "now that several more advanced techniques have been developed," they've decided to let it loose for all to use. Needless to say, there's some partition-making and a good deal of command line work involved in the feat (all of which could cause you some serious headaches), but once you've got everything set up, you'll apparently be able to switch between different OS versions just by changing your root-device with a simple command. As iPhone Atlas points out, that option will likely become a lot more attractive once the SDK-compliant 2.0 firmware is released, but if you've got some ideas of your own in the meantime, you can find all the details you need at the link below.

[Via iPhone Atlas, thanks Shan]

While this would be all the more sweet on a 3G iPhone, a new series of hacks will now give you untethered EDGE networking from your laptop. Starting with jailbreak as any proper iPhone hack must, the latest hack installs a new SOCKS server on your iPhone. Join your iPhone and laptop to the same ad-hoc WiFi network and you're pretty much good to go. The procedure is a bit cumbersome if this is your first hack attempt so be sure to check the YouTube video-how-to before you get going. Check it after the break.

[Via MacRumors]

Well, that didn't take long -- the hacker crew of IRC channel #iPhone has managed to enable shell access to the iPhone just a week after its release. There's not a lot to the hack -- the iPhone's 30-pin dock connector features the same pinouts as the iPod, so creating a serial connection simply involved connecting up a resistor, ground, and RS-232 level converter and running a few commands from iphoneinterface. The resulting shell is pretty basic, but features a TFTP client -- meaning that we should see a flood of attempts to open the iPhone up in the coming weeks (as if we wouldn't anyway).

Read - hackint0sh announcement
Read - iPhone shell command list