While we all wait for an untethered jailbreak solution, the Dev-Team has updated redsn0w with a "one-click
" option for the tethered 4.2.1 jailbreak. Rather than the multiple screens you normally see, you can now use redsn0w on the command line to "Just boot tethered for now."
There are currently two major efforts towards an untethered jailbreak. The "jailbreak monte" backup plan is still in beta, and is only available to developers who have access to