Mr Grove... here is what D-Link have to say about sharing.
"Two computers can simultaneously connect to the DSL-302G through its USB and Ethernet port to share its high-speed Internet connection. You can connect to its Ethernet port regardless of the operating system you are using, or connect to its USB port to allow easy installation to a USB equipped computer running 98SE, Me, 2K, XP, or Mac OS 9 and OS X.
The modem comes with a simple configuration tool and a web-based Graphical User Interface (GUI) that allows you to easily modify settings to connect to an Internet Service Provider (ISP). Connection speed, traffic statistics and other detailed information are displayed. "