RE: private ip addresses from ISP

While we're on the topic, perhaps I should ask for some best practices (where 'best' equals one for every listserv member) on the use of RFC 1918 addresses within a network provider's infrastructure. We use private addresses for some stub routes, as well as our cable modems. Should we aggressively move away from private stub networks? And for the second, should we specifically limit access to those cable modem IPs to just our management network ? Right now any of customers could do an SNMP sweep and identify them all, but I don't really care that much about that, or should I? And yes, I do have RFC 1918 filters on our outbound traffic. =) Frank