After a few months of tinkering with getting to know this guy, and doing my final (for now?) hardware mod and getting a proper serial connection in place, I've finally replaced my old Asante router that had served me well these last several years.
The trickiest bit was figuring out the iptables command and setting things up so that I could access my web/mail server via the LAN using the WAN address (so I could refer to it by name instead of a local IP). This posting over on the OpenWRT forums was a great help in doing exactly what I needed.