FYI, I'm running 2.0 and the process listed in the wiki didn't work for me (dsl in bridge mode with pfsense doing the pppoe). I could ping the modem (192.168.0.1) from the pfsense box, but nothing else on the LAN could. What I did was add the OPT interface, set its IP to 192.168.0.2, and instead of leaving the gateway blank, added a gateway that points to itself (192.168.0.2). I then added a route to the 192.168.0.0 subnet with the OPT int as the gateway. Didn't have to add an outbound NAT entry.
EDIT: I did need to add a NAT entry for it to work right.