I too have noticed quite a few printer trouble threads lately.
My Canon Pixma has had no issues under 10.3.7 or 10.3.8. Canon truly did a tremendous job with their OS X drivers...yes, they're even better than the Windows drivers, in my opinion.
While I've only used HP printers with Windows, I have found the drivers to be less than stellar. Perhaps changes made in the latest OS X update are the cause of these problems. Who knows?