My HP printer stopped scanning after the HP 2.7 Update. How do I roll it back?

Question

I upgraded to Lion and my new HP Photosmart Premium (C309g) worked great until the HP Printer Software Update 2.7 came down.  Since then, whenever I try to scan anything in Preview, Image Capture, or the printer itself, the scan window sits at "Scanning document 'Document Name'" forever.  The progress bars come and go, but it never finishes.
I talked with a useless half-wit at HP and he told me to wipe my Mac and Time Machine backup and reinstall from my recovery CD's.  (Too bad my recovery discs install Tiger!)  I told him that wasn't happening, and he had me reset the printing system, which did nothing.
How do I roll back the HP 2.7 update?
Upgrading to Mac OS X 10.7.1 today didn't solve the problem.

Answer 1

I was hoping for a cleaner solution, but Time Machine to the rescue.
I removed everything under /Library/Printers (except PPD's) and then restored the rest from my first TM backup after installing Lion.  That and a reboot fixed all of the printing problems.
However, I tried the same trick for the /Library/Image Capture folder, but it didn't work.  It at least remembers my scan settings now, but the scan still hangs at some point in the beginning, usually on "Scanner is warming up" or the first piece of "Scanning document name."
Also, for cleanliness' sake, I removed the HP 2.7 entry from the InstalledSoftware.plist file, and told Software Update to ignore it.