If you own an A4 device, chances are you spent your day jailbreaking. After months of waiting on a proper iOS 5 exploit, both the Chronic and iPhone Dev teams released untethered jailbreaks late last night.
There have been reports, however, of folks having some problems with the new untethers. One issue in particular, a "launchctl" error, has been fairly common. So Saurik has pushed out an update for the untether to fix it...