1) Is there a general convention about addresses for DNS servers? NTP servers? dhcp servers?
DNS server addresses should be short and easy to tape, as already mentioned.
2) Are we tending to use different IPs for each service on a device?
In many cases yes - because that makes it possible to easily move the service to a different box.
Finally, what tools do people find themselves using to manage IPv6 and addressing?
Excel spreadsheets, HaCi.
It seems to me that IPAM is almost required to manage IPv6 in any sane way, even for very small deployments (My home ISP gave me a /56 and a /64).
At least as long as you use static addresses. We like static, and tend to stay away from SLAAC. We do *not* use EUI-64 for router links. For customer links we use /64, for backbone links we use /124 (ensures that SLAAC can never ever be used on the link, and also that the two ends can be numbered ending in 1 and 2 - nice and simple). Steinar Haug, Nethelp consulting, sthaug@nethelp.no