iOS 5.1.1.
All Devices
Use Absinthe 2.0. -> Absinthe

iOS 5.1.
iPhone 4S, iPad 2, iPad 3
nothing yet, sorry

Others Devices
you can do a tethered jailbreak via Redsnow -> Redsn0w

iOS 5.0.1.
iPhone 4S,iPad 2
use Absinthe 0.4 -> Absinthe

Others Devices
use redsn0w -> Redsn0w

iOS 5.0
iPhone 4S
use Absinthe 0.4 -> Absinthe

iPad 2
please upgrade to a jailbreakable firmware

Other devices
you can do a tethered jailbreak via Redsnow -> Redsn0w

You can use 'Redsnow'. It's allowing to jailbreak iOS-5.0.