Spirit, Blackra1n or Redsn0w for iTouch 3g

[Carl]

Which is easiasest fastest and has the
most features

[Rashy]

Spirit as it's un-tethered and it installs cydia straight away rather than downloading it through the jailbreak app.

[lemonlimecom]

If you have a 3rd gen spirit is likely your only option. 3rd gen usually come with 3.1.3 preinstalled.

[BrQ]

spirit for sure

[PieClock]

Spirit. The features are the same in all of them.