Josh: I'm currently rolling out support for more instant updates using nsupdate.info so long as you're doing your updates via: http://ipv4.nsupdate.info/nic/update?hostname=

So that's using http, not https and being sure to include the hostname=yourhostname.domain.com

Or perhaps someone could answer if more dyndns providers are even required. I tried using a CNAME record and that worked. So what I'm really asking is how often to you poll hostnames in our accounts?