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Untethered jailbreak
Summary
An untethered jailbreak is a jailbreak where your device does not require you to reboot with a connection to an external device capable of executing commands on the device.
Device
All iPhone, iPod touch, and iPad models including the iPhone 4 have an untethered jailbreak at the latest firmware available.
Devices with a newer bootrom, which include some iPhone 3GS units, "MC" model iPod touch 2G units, iPod touch 3G units, and iPhone 4 units can't have a untethered jailbreak by Pwnage Tool. However, it is possible to perform a untethered jailbreak on any device with any firmware between iOS 3.1.2 and 4.0.1 using JailbreakMe (This include any iPad models, running 3.2 or 3.2.1).
Operating System
As of right now, there is no way to jailbreak the iOS 4 untethered on Linux-based operating systems. This can be done, however, with Mac OS X or Windows.