do a google search and download tiny umbrella
reboot your ipad into restore mode and then click restore in itunes, itunes will download and install 3.2.2
at the end of the restore itunes will give an error and say it didnt work. Your ipad will say connect to itunes as if it needs to be restored agian.
now open tiny umbrella and click the button that says Kick device out of restore mode. Your ipad will then come back to life with 3.2.2 installed.
nothing special has to be done other than loading tiny umbrella at the end to kick the ipad out of restore mode. you can restore 3.2.2 in itunes without having the shsh saved because its still the current public version and apple is still handing out the shsh blobs when the ipad asks durring a restore.