Here is the link for Felixbruns –
Here is the link for Blackra1n – http://blackra1n.com/
Link for original Jailbreak video – http://www.youtube.com/watch?v=uFmwo_UjeAU
Link for iphone and ipod touch free firmware upgrade video – http://www.youtube.com/watch?v=5aqqzP2nFMA .