Another useful article for MOM 2005 admins. This one described the process for configuring MOM 2005 to accept and process SNMP traps. Between application logs, SYSLOG and traps, you should be able to manage a lot, if not most, of your heterogeneous environment with MOM 2005 without buying 3rd party manaagement packs and agents (though I think I might still recommend this for time savings).