Question : How do I Configure Multiple Gateways?

Hello, I need assistance configuring multiple gateways.  Basically I want to setup load balancing and failover using 2 T1 lines and one cable connection.  there will be multiple servers placed behind this Firewall/Gateway.  Can anyone give me advice with regards to what products are available to help me both Open Source or Vendor specific.  We are also considering registering our own network space with ARIN and implementing BGP and/or any other protocols that may help.

Answer : How do I Configure Multiple Gateways?

I think what you're looking for is Multilink PPP
Here's an article discussing the configuration of a Cisco 3845 to use MLPPP
http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a0080112d3b.shtml

here's an article discussing MLPPP in general
http://www.linuxjournal.com/article/3149

DD-WRT is not a solution here  but tomato is - even though it's a consumer device firmware, there a version of tomato that supports MLPPP that is also available for linux , and even a compact linux distro from http://fixppp.org/

Try the Linux/MLPP package on the download page - http://fixppp.org/index.php?p=download

you might also check out the Linux Network Appliance distro from the same group
http://zeroshell.net/eng/

Note:  this open source solution is still in alpha