I experimented with Verizon dsl and Comcast cable. Have a multi-wan input router as well, but that didn't work out great. Anyway, I was able to hook both up to one computer, 2 nic's. If the cable disconnected, dsl would take over, until the cable came back on. I absolutely hated dsl though, so I got rid of it. Cable gives me 20Mbit now, so I'm happy.
