Ipad:

3.2.2: Redsn0w

3.2.1: Redsn0w

(More coming soon!)

Iphone/Ipod touch:

3.1.2: Blackra1n

2.2.1: Blackra1n

2.2.2: Blackra1n

4.0: Greenp0ison or Redsn0w or jailbreak me

3.1.3: Blackra1n or limera1n

4.1: Pwnage tool or Greenp0ison or Redsn0w or limera1n or jailbreak me

4.2: Redsn0w or Greenp0ison or pwnage tool or limera1n or jailbreak me

4.2.1: Redsn0w or Greenp0ison or pwnage tool or limera1n

2.2: Yellow Ra1n + (unknown)

Other specific jailbreaks: pinkra1n, sn0wbreeze, bluera1n, other +++

Ipod Nano:

(coming soon)

Apple tv:

Specific jailbreaks: Jailbreak me or Redsn0w (i think they work for all firmwares)

More coming soon! see the iphone help page for more information on jailbreaking