Apple slyly updated the iOS 5 b6 firmware for the original iPad without changing the version number, breaking the current jailbreak. The Dev-Team has released a fresh build of redsn0w to deal with both the new IPSW and original, as well as support for 4.3.5 and 4.2.10. Head over to the link below to download the tool, but keep in mind that all jailbreaks are tethered unless you’re hanging back at 4.3.3.
Update #7: Apple updated the iPad1 iOS5b6 IPSW without changing its version number or filename, so we’re releasing redsn0w 0.9.8b7 to handle both the original and changed IPSW. We’ve also added explicit support for a tethered 4.3.5/4.2.10 jailbreak (instead of pointing at the 4.3.4/4.2.9 IPSWs) and fixed a 4.2.10 problem.