Credits
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iPhone DevTeam 2007-2011 - Thanks to all the DevTeam for their help with this tool.

Additional Credits
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4.3.3 untether:
vulnerability: Stefan Esser (@i0n1c)
exploit: Stefan Esser (@i0n1c)

4.3.2 untether:
vulnerability: Stefan Esser (@i0n1c)
exploit: Stefan Esser (@i0n1c)

4.3.1 untether:
vulnerability: Stefan Esser (@i0n1c)
exploit: Stefan Esser (@i0n1c)

4.2.1 untether:
vulnerability: chronic dev team
exploit: chronic dev team

limera1n for iPhone 3GS, iPhone4, iPad, iPod touch 3G, iPod touch 4G:
vulnerability: geohot
exploit: geohot

24kpwn for iPod touch 2G and early-model iPhone 3GS:
vulnerability: pod2g, MuscleNerd
exploit: planetbeing, CPICH, posixninja, chronic, pod2g