MacOSX - Is it possible to have two internet connections on the same computer?

I have a Mac and I connect to the web using my cable modem. But I have access to a wifi connection that could give me a second web access.

I can enable both on system preferences, but when I access the web, the iMac uses the wifi.

Each of these connections gives me 30 Mbps.

I was wondering if there was a way to have both enabled and have a sort of 60 MBPS super connection... is this possible? I mean, to combine two accesses and have one big connection?

What you are describing is kind of like an Aggregate Connection. Xserves with two ethernet ports can do it, if ethernet switch supports it, and get up to 2Gbps from the local network. Two internet connections can be aggregated with the right equipment.

The problem is that you're still limited by the one 30Mbps connection. Pulling data from the same connection two different ways can't improve the speed.