As wee all know at this time only EIGRP supports unequal load balancing (ULB).
But why this feature is not implemented in Static Routing?
This is so simple to implement, and is is very usefull when we use default routes to 2 SP with different link speed (so we need unequal load balancing).
More about blog.ioshints.info/2007/02/unequal-load-split-with-static-routes.html