I'm wrapping my head around the Standby Server feature, and there's only one aspect that I can't figure out. I use Webdirect, so I'm forwarding port 80 to the internal ip address assigned to my primary server. If that were to go down, my standby server would take over - but it's assigned a different ip address - so my router's port forwarding rules will still be pointing to the ip address of the primary server. Is this accurate? If so, is there a way around this?

If your router allows, forward based on DNS names then you can just update your DNS and have all the rest fall into place.

Otherwise; yes: you would have to update the port forwarding.