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•Internet Gateway from ViacomSoft (PC and Mac compatible)
•MidPoint from MidCore
»www.midcore.com/ (currently offline, but possibly available elsewhere)
Both are software router/firewall/NAT solutions that allow connection teaming, be it 2 or more cable modems, cable/dsl, cable/dial-up, or any other combo. They both allow parallel downloading and/or fail-back connections (where one connection takes over if the other fails), in addition to all the other features offered.
There are also a few different hardware options out there too, that do a similar thing for a high price.
•Nexland PRO 800 Turbo Internet Sharing Box
•Symantec Symantec Firewall/VPN Appliance (Models 200 or 200R)
This is by no means a complete list, its just to give an idea of what I have found in a relatively short time.
Here is a white paper that explains how this works:
Vicomsoft White Paper: HTML or PDF.