Currently I have a setup that involves connections from several different 
providers ranging from 6 mbit DSL's to 10 mbit fractional DS3 connections tied 
together to provide multipath high availability internet in our area for 
schools and businesses.  We recently extended our coverage to another area 
which has several other ISP's.  The box that is doing multiwan right now is the 
only gateway for the entire network and for some sites it is several hops back 
to that gateway.  My goal is for us to purchase bandwidth in other locations, 
install a linux box and have multiple gateways available, but I think this is 
easier said than done.  I will diagram this as best I can for you in current 
and future setup modes.

Currently:

ISP 1                 ISP 2              ISP 3             etc...
  |                           |                      |                    |

                           Multiwan box
                      
                                      |

                                 Area 1

                   /                  |                 \

             Area 2          Area 3           Area 4

Goal:

Currently:

ISP 1                 ISP 2              ISP 3              etc...
  |                           |                      |                    |

                           Multiwan box
                      
                                      |

                                 Area 1

                   /                  |                 \

             Area 2          Area 3           Area 4

              |                                           |
       Linux Box                             Linux Box
              |                                            |
           ISP x                                    ISP y

My goal is for people in area 1-4 to all be able to use any of the connections 
to ISP 1-z and if one fails it passes the traffic through the network to an 
available route.  Area 1-4 don't current have any linux hardware but it has 
been a long standing plan to put some in place in those areas as well so if 
that is required it could be done.  These areas are all serviced by different 
small ISP's and would make acceptable alternate routes say if a backhual failed 
for some reason so that is the goal.

Thanks for any input.
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