[darkpuppet]

The problem is that the modems define their own gateways, and your router or whatever is plugged into them use the modem as a gateway.. the only way to see any type of improvement might be to put a computer in the middle there that load balances stuff going through the modems, but each request only goes through one gateway, or one modem.

If you have 2 DSL lines, you can buy special DSL modems that will bind the two together for double the bandwidth, but those are pretty pricey IIRC.