How to create firewall rules for an incoming dual-wan setup

[ameir]

This is probably a baby question, but it is something I'm kind of confused about.  I'd like to have a pfSense box handle two T1s.  It will be in front of a number of servers that need to be accessed externally.  When adding forwarding rules, must I make two rules (one for each public IP) to point to each server?  How does pfSense determine which connection to use at any given time?  Also, what is the best way to point to a hostname?  Should I just do a round-robin DNS setup that points to both public IPs for each server?

I already have a single-wan setup that works well, and that I'd like to extend to handle the second T1.

Do you have any answers or tips for any of this?  Btw, I know I can just consult the howtos instructions on how to do this; they just don't answer my basic questions.

Thanks!