Windows 7 - Advice on Multi-Wan Network

Please help. I have two Internet connections in my house. 1) ATT Uverse with multiple computers and devices connected and 2) Comcast Cable with several computers and a couple of printers connected. What I would like to do is to be able to take advantage of both connections and also share printers between the two networks. I do have a Windows 7 Ultimate x64 computer that can have multiple NIC's in it and that computer does have access to both internet connections behind the two separate routers. Is there a way to do this? Thanks in advance

Without an advanced hardware gateway or manufacturer specific (I know HP servers can do it) dual LAN bonding, no.

Technically it can't be done "at the same time" because that's like asking one connection to download the first half of a web page and the second download the second half. It is VERY complicated and I don't think it can be done in the capacity you are asking for.

Now you CAN hook the two ISPs in to one gateway, given you spend a few grand on said gateway.