Can you use two internet connections to increase bandwidth?

[A Bored Nerd]

Nope, not that I know of. Some fancy routers or maybe distros of Linux/BSD designed for router/firewall use might be able to pull it off, but I doubt that there's much the average person can do in software. Doing it with wireless is probably even less likely.

--edit--
Try searching for "multiple internet connections"
* http://www.anandtech.com/guides/viewfaq.aspx?i=156
* http://www.tomshardware.com/forum/21544-...me-network
* http://www.tomshardware.com/forum/22596-...e-wireless

Basically $$$ and not going to really speed things up but rather balance out the load (I.E. you can do more at once but for any single download you'll only be using one connection. I suppose maybe bittorrent would be a bit smarter but I doubt it.) Save your energy the benefit isn't going to justify the cost and effort.