Well, I missed the deadline since I just rediscovered the MacFixit Forums but I have not been able to print using my HP ColorLaser Jet 3800dn since upgrading to SL. I even Emailed HP and they responded saying they would look into it. Even the recent HP software upgrade did not resolve my printing issues.
The drivers are not available for download on the HP site.
Right now, I assume this is an issue HP is actively working to resolve.