It truly depends on what type of routing protocol you are using. If you have EIGRP you can perform load balance over multiple paths of equal or unequal. You have to configure it for this but you can get it work. Most people think of floating default gateways as a failover use only. I'm of the mind that if I have another path I am paying for I am going to use the thing!
You can do it w/o a routing protocol. Just turn on ip cef and then do ip loadsharing per-packet or per-destination.
I.E
ip cef
inter ser0/0
ip address 55.55.55.1
!
inter ser0/1
ip address 66.66.66.1
!
inter fa0/0
ip address 11.11.11.1
ip loadbalancing per-packet
!
ip route 0.0.0.0 0.0.0.0 55.55.55.2
ip route 0.0.0.0 0.0.0.0 66.66.66.2
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