singion

Im just wondering if anyone knows if its possible to host a server on two isps at the same time. by that i mean 2 seperate modems plugged in via ethernet to the computer, some players having one ip others having the other ip. I ask because the server I currently run is running off the fastest broadband currently available in my area in the uk but every so often we hit a fair usage policy that cripples us for a few hours, My idea is that if we should share the load accross 2 connections we could avoid the fair usage altogether. Does anyone know if this is even possible. Im not on about combining the 2 lines into 1 faster but rather keeping them completly seperate and plugged in via 2 seperate ethernet ports. cheers for any help and I hope ive explained myself clear enough