Note: An official response from HP has been that “Officially HP does not share any mibs.”. If you are planning on purchasing HP equipment, inform them that this is a bad decision and take into account this information when evaluating product feasibility.
HP LaserJets seem to have few problems regarding SNMP monitoring.
Most LaserJets return non-sequential items at some point. To perform a full snmpwalk, pass -Cc to snmpwalk.
When using Zabbix 1.4.2, string OIDs did not work for me (but they worked ok with net-snmp). I had to use numerical OIDs.