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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 currently 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 PwnageTool, as they would need the signature checks patched since they don't have the 24kPwn exploit anymore.
However, it is possible to perform a untethered jailbreak on any device with any firmware version between 3.1.2 and 4.0.1 using Jailbreakme (This include any iPad models, running 3.2 or 3.2.1).
Operating System
[Jailbreakme] runs on the iDevice itself, so the untethered iOS 4.0 jailbreak is completely independent from the operating system (Windows, MacOS, Linux, ...) of the computer which the iPhone syncs to.