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Tethered jailbreak
Tethered means being basically "attached" to your computer in a way; you must boot your device by running code on it (via the dock connector) to make use of an exploit.
iPod touch 2G
The initial jailbreak for the iPod touch 2G was tethered, until the hybrid dev team released the 0x24000 Segment Overflow. The codename for the tethered jailbreak was redsn0w Lite.
Linux
Currently, certain devices are capable of booting to Linux. The downside is that this is a tethered boot.